Blick’s approach to mediums is slightly different from their paints. While they split their paints into "Artists" (Professional) and "Studio" (Student), most of their mediums are branded as "Blick Studio."Crucial context: Do not let the "Studio" label scare you here. In the world of chemistry, "Studio" linseed oil is often identical to "Professional" linseed oil. The price difference usually comes from the packaging (plastic bottles vs. glass) rather than the chemical purity.1. The Oils (The Binders)The backbone of oil painting. Used to thin paint while keeping it "fat" (oily).Blick Studio Linseed Oil:Type: Alkali refined.Chemistry: This is the industry standard. "Alkali Refined" means the oil has been washed with alkaline chemicals to remove impurities that cause yellowing. It is paler and yellows less than "Cold Pressed" oil.Use: General purpose thinning. It increases flow and gloss.Comparison: It is chemically almost identical to Winsor & Newton Refined Linseed Oil but costs significantly less.Blick Studio Stand Oil:Consistency: Honey-like.Process: This is linseed oil that has been heated (polymerized) until it becomes thick and syrupy.Effect: It levels out brush strokes (enamel-like finish). It is significantly tougher and more flexible than standard oil.Best For: Glazing. Because it is so thick, you mix it with solvent to create a smooth, glass-like glaze.2. The Solvents (The Thinners)Used to clean brushes and thin paint for the "lean" (first) layers.Blick Studio Odorless Mineral Spirits (OMS):The "Gamsol" Alternative.Safety: It has had the harmful aromatic solvents (the stuff that gives you headaches) removed.Performance: It evaporates completely without leaving a residue.Comparison: While Gamsol (Gamblin) is widely considered the "gold standard" for the absolute lowest toxicity, Blick OMS is a very close second and is perfectly safe for standard studio use.Use: Thinning paint for underpainting and cleaning brushes.Blick Studio Turpentine:Chemistry: Distilled turpentine (from pine trees).Smell: Strong pine odor.Why use it? Some traditionalists prefer it because it dissolves Damar resin (OMS does not) and has a slightly more "tooth" or "bite" into the canvas than mineral spirits.Warning: Significantly more toxic than OMS. Requires good ventilation.3. The "Alkyd" Style Mediums (Fast Drying)These are modern mediums designed to speed up the slow drying time of oil.Blick Studio Quick Glaze:The "Liquin" clone.Consistency: Soft gel.Behavior: When you mix it with paint, it makes the paint more transparent (for glazing) and speeds the drying time significantly. (Touch dry in ~24 hours).Finish: Glossy.Best For: Artists who want to paint in layers without waiting a week for each layer to dry.4. The Varnishes (Final Protection)Applied only after the painting is fully cured (6+ months).Blick Studio Damar Varnish:Chemistry: Natural Damar resin dissolved in turpentine.Finish: High gloss.Traditional: This is the "Old Master" varnish. It gives a warm, deep glow to dark colors.Drawback: It yellows slightly over 50+ years and becomes brittle. (This is true of all Damar, not just Blick's).Blick Matte Varnish:Chemistry: Damar with added wax/matting agents.Use: If you hate the "shiny plastic" look of oil paintings, this knocks the sheen down to a flat finish.5. Summary ChecklistRefined Linseed Oil: Alkali refined / Low yellowing / Standard thinner.Stand Oil: Honey consistency / Enamel finish / Best for glazing.Odorless Mineral Spirits: Low toxicity / No smell / Best for cleaning & underpainting.Quick Glaze: Gel medium / Fast drying / Liquin alternative.Damar Varnish: High gloss / Traditional finish / Use only on dry paintings.

Bob Ross (Bob Ross Inc.) is not just a paint brand; it is a system. The entire "Joy of Painting" technique relies on a specific chemical rule: "Thin paint sticks to thick paint."If you try to use standard oil mediums (like Liquin or linseed oil) with this technique, you will fail. Bob Ross mediums are chemically designed to keep the canvas wet and slick for 2–3 hours, allowing you to blend huge skies and water in seconds.1. The "Liquid" Base Coats (The Foundation)You cannot start a Bob Ross painting without one of these. They are applied to the dry canvas before you touch a color.Liquid White (Magic White):The Product: A fluid, slow-drying titanium white.The Function: It wets the canvas. Because it is wet, when you apply a stiff blue paint on top, the two mix on the canvas to create a gradient sky.Application Rule: "Thin and even." You must apply it, then wipe most of it off with a paper towel. If it is too thick, your trees will slide off the canvas.Chemistry: It is essentially titanium white pigment mixed with a slow-drying oil (safflower/linseed) to a cream consistency.Liquid Clear:The Use Case: Black canvas paintings.The Function: If you painted black gesso on a canvas, it would be dry and rough. Liquid Clear oils the surface so your colors glide and blend, but it is transparent so the background stays black.Warning: It is much stronger than Liquid White. You need a tiny amount. If you use too much, the paint becomes an uncontrollable grease slick.Liquid Black:The Use Case: Dark seascapes or night scenes.The Function: Same as Liquid White, but it starts your painting in the dark. Used less frequently.2. The Paints (The Consistency)Why you can't use Winsor & Newton or Blick Oils with this system.Bob Ross Oil Colors:Consistency: Extremely stiff / dry.The Logic: Remember the rule: "Thin sticks to thick." The base coat (Liquid White) is thin. Therefore, the paint you put on top (Bob Ross Oil) must be thick.The Failure: If you use a soft, buttery paint (like Blick Artists' Oils), it is too thin. It will not stick to the Liquid White; it will just mix with it and turn into "mud" instantly.Key Colors: Midnight Black, Van Dyke Brown, Sap Green, Alizarin Crimson, Phthalo Blue.3. The Cleaning SystemThe "Beat the Devil Out of It" method requires specific chemicals.Bob Ross Odorless Thinner:The Product: Highly refined mineral spirits.The Function: It dissolves the oil paint instantly to clean the massive 2-inch brushes.Safety: Do not use hardware store paint thinner. It smells terrible and can melt the glue in some brushes.The "Bucket & Screen": The system requires a bucket with a wire screen in the bottom. You scrub the bristles against the screen to remove solids.4. Comparisons: "Can I use...?"Can I use linseed oil instead of Liquid White?No. Linseed oil is clear and too slippery. Liquid White contains pigment, which provides the opacity needed to make clouds blend.Can I use gesso instead of Liquid White?No. Gesso is acrylic (water-based) and dries instantly. Liquid White is oil and stays wet.Can I use any white oil paint?Only if you dilute it. You can make your own "Liquid White" by mixing a stiff titanium white with linseed oil until it is the consistency of heavy cream.5. Summary ChecklistLiquid White: Wet foundation / Essential for skies / Apply thin.Liquid Clear: Transparent oil / Essential for black canvas / Apply very thin.Bob Ross Oil Paint: Dry & stiff / Prevents mud / Do not use soft oils.Odorless Thinner: Solvent / Cleaning only / Do not use to thin paint for painting (unless making ink-like consistency for liners).

Gamblin (Portland, Oregon) is arguably the most chemically responsible oil paint manufacturer in the world. Their philosophy is "studio safety."They reinvented traditional painting mediums (which used to contain lead, arsenic, and turpentine) using modern alkyd resins and Odorless Mineral Spirits. If you want the effects of the Old Masters without the toxic fumes, Gamblin is the standard.1. The Foundation: Gamsol (The Solvent)The safest solvent in the industry.What it is: 100% odorless mineral spirits (OMS).The Chemistry: Gamblin refines standard mineral spirits to remove 99.9% of the aromatic hydrocarbons (the harmful, smelly parts).Flash Point: It has a high flash point, meaning it evaporates slower than turpentine and is less likely to combust.Usage: Used for thinning paint, cleaning brushes, and creating your own mediums. It is the base for almost all other Gamblin liquid mediums.2. The "Galkyd" Series (The Speed Agents)Alkyd resin mediums designed to make oil paint dry faster.Galkyd (The Original):Consistency: Like honey.Effect: Fast drying (24 hours).Finish: High gloss.Behavior: Self-leveling. If you want a smooth, enamel-like surface without brushstrokes, use this.Galkyd Lite:Consistency: Thinner oil.Effect: Fast drying, but less viscous than the original.Behavior: It retains brushstrokes better than standard Galkyd. It will not level out your texture as aggressively.Galkyd Gel (formerly G-Gel):Consistency: Thick jelly.Effect: Creates Impasto effects (thick texture) that dry safely.Why use it? If you pile up thick oil paint alone, the outside skins over and the inside stays wet (causing cracking). Galkyd Gel hardens the paint from the inside out.Galkyd Slow Dry:The Exception: This is the only Galkyd designed to keep the paint wet for longer (a day or two), similar to poppy oil.3. The "Neo Megilp" (The Silky Gel)The modern replacement for the "Lost medium of the Masters."History: The Old Masters used a medium called "Maroger" or "Megilp" (cooked lead and mastic resin) to get a silky, thixotropic feel. It was toxic and yellowed badly.The Gamblin Solution: Neo Megilp.Consistency: Soft gel.Feel: Silky. It feels like painting with lubricant. The brush glides effortlessly.Thixotropic: It stays thick in the tube, but becomes fluid when you move your brush through it, then sets up thick again when you stop.Finish: Satin (not high gloss like Galkyd).4. The "solvent-free" lineFor artists working in small rooms or with sensitivities.Solvent-Free Gel:Binder: Safflower oil + alkyd resin (No Gamsol).Consistency: Dense, like the paint itself.Effect: Increases flow and transparency without thinning the body of the paint. It holds sharp brush marks perfectly.Solvent-Free Fluid:Consistency: Liquid oil.Effect: Increases fluidity for flowing strokes, but without the vapors of Galkyd.5. Cold Wax MediumThe matte texturizer.What it is: Beeswax + Gamsol + alkyd resin.Consistency: White paste (like shortening).Effect:Matte Finish: It kills the gloss of oil paint completely.Body: It adds bulk to the paint for heavy texture.Varnish: It can be rubbed over a dry painting as a final matte wax varnish.Usage: You can mix it 50/50 with oil paint. It is excellent for palette knife painting.6. Gamvar (The "Magic" Varnish)The only varnish you can apply before the painting is cured.The Problem: Traditional Damar varnish requires the painting to be 100% cured (6–12 months). If you varnish too early, the varnish cracks as the paint shrinks.The Solution: Gamvar.Chemistry: Synthetic resin (Regalrez) dissolved in mild solvent.The Rule: You can apply it as soon as the painting is "touch dry" (usually 2–3 weeks).Mechanism: It allows the paint to "breathe" (oxidize) through the varnish layer.Finishes: Gloss, satin, and matte.7. Summary ChecklistGamsol: Odorless spirit / Safety base / Cleaning brushes.Galkyd: Fast dry / High gloss / Levels brushstrokes.Galkyd Lite: Fast dry / Less gloss / Retains brushstrokes.Neo Megilp: Soft gel / Silky feel / Satin finish / Best for glazing.Solvent-Free Gel: Non-toxic / Heavy body / Holds marks.Cold Wax: Beeswax paste / Dead matte / texture.Gamvar: Varnish / Apply when touch dry / Breathable.

M. Graham & Co. (Oregon, USA) is a boutique manufacturer with a fiercely loyal following due to one specific chemical choice: Walnut oil.While 90% of the industry uses linseed oil (which dries fast but yellows) or safflower oil (which is clear but brittle), M. Graham revives the Renaissance tradition of using walnut oil. Their entire medium system is built around a philosophy of solvent-free painting, making them the #1 choice for artists with small studios, allergies, or health concerns.1. Walnut Oil (The Pure Medium)The core of the M. Graham system. It is a dual-purpose fluid: a painting medium and a brush cleaner.Chemistry: 100% Pure walnut oil.The "Yellowing" Advantage:Linseed oil naturally yellows over time (turning blues into greens).Walnut oil is virtually non-yellowing. It remains crystal clear, allowing for brighter whites and cooler blues.Drying Time: Slow.Because it lacks the rapid oxidation of linseed, walnut oil stays wet longer. This gives you more "open time" to blend and rework edges.The "Studio Cleaner" Function:M. Graham promotes a method where you do not use turpentine or Gamsol to clean brushes.The Method: Dip dirty brush in walnut oil -> Wipe on rag -> Repeat -> Wash with soap. This removes toxic fumes from your studio entirely.2. Walnut Alkyd Medium (The Dryer)The "Speed Agent." For artists who love the feel of oil but hate the waiting.Chemistry: Walnut oil + alkyd resin.Function: Accelerates drying.While pure walnut oil is slow, adding a few drops of this medium makes the paint dry to the touch in 24 hours.Texture: Sticky / tacky.Unlike the slippery pure oil, the alkyd medium adds "drag" and body to the paint, making it feel slightly stickier. This is excellent for glazing and layering.Gloss: High gloss.It increases the refractive index of the paint film, making dark colors look deeper and richer.Compatibility: It is fully compatible with the pure walnut oil, so you can mix them to create a custom drying rate.3. The philosophy: Why no solvents?Most brands sell odorless mineral spirits (OMS) or turpentine. M. Graham explicitly does not.The Health Factor: M. Graham was founded by an artist (Art Graham) who wanted to create a safe system for artists. They believe solvents are unnecessary if you use oil to clean oil.The Flow: Because walnut oil is naturally more fluid (thinner) than cold-pressed linseed oil, you don't need "thinner" to make the paint flow. The paint is naturally loose right out of the tube.4. Comparison: walnut oil vs. linseed oilYellowing: Walnut oil has very low yellowing; linseed oil has moderate yellowing.Drying Speed: Walnut oil is slow (3-4 days open); linseed oil is medium (2-3 days open).Film Strength: Walnut oil is flexible; linseed oil is very tough (forms a harder skin).Fluidity: Walnut oil is high (runny); linseed oil is medium (viscous).5. Summary ChecklistWalnut Oil: Non-yellowing / Slow drying / Safe brush cleaner / Best for wet-on-wet.Walnut Alkyd: Fast drying / Glossy / Resin based / Best for glazing & underpainting.System Benefit: Zero solvents / No fumes / Best for home studios.

Old Holland (Est. 1664) is the oldest paint factory in the world. Their philosophy is simple: "Paint like the Old Masters."While brands like Gamblin or Winsor & Newton use modern chemistry (Alkyds/Gamsol) to make painting easier/faster, Old Holland refuses to modernize if it compromises the historical accuracy of the paint film. Their mediums are famously "low tech" in the best way possible—using sun-bleaching and windmills rather than chemical refining.1. The Pure Oils (The "Windmill" Series)Old Holland is one of the only brands that still presses linseed in a traditional windmill to avoid the heat of industrial presses.Sun Bleached Linseed Oil (The Flagship)The Process: This is their most famous oil. They take cold-pressed linseed oil and expose it to sunlight in shallow glass trays for months.The Chemistry: UV light naturally bleaches the yellow chlorophyll out of the oil and slightly thickens it (pre-polymerization).Result: It is paler than standard linseed oil and dries slightly faster. It is the closest thing you can buy to the oil used by Vermeer or Rembrandt.Best For: General painting medium, especially for blues and whites where yellowing is a fear.Cold Pressed "Windmill" Linseed OilThe Difference: This is pressed without heat (which creates impurities) but is not sun-bleached. It is darker (golden yellow).Behavior: It forms the toughest, most flexible film of any oil. It is the "structural steel" of oil painting.Best For: Making your own paint (grinding pigment) or dark colors.Refined Poppy OilThe "Clear" Oil: Poppy oil is naturally paler than linseed and virtually non-yellowing.The Trade-Off: It dries extremely slowly (can take weeks) and forms a weaker film that can crack if painted too thickly.Best For: Wet-on-wet blending of white, pale skin tones, or sky blues. Never use it for underpainting.Stand OilThe "Leveler": Linseed oil that has been heated (polymerized) until it turns into a thick honey consistency.Finish: Enamel-like gloss. It eliminates brush strokes completely.Best For: Final glazing layers where you want a glass-like finish without texture.2. The Painting Mediums (Pre-Mixed)Old Holland offers simple mixtures for artists who don't want to mix their own oil and turpentine.Oil Painting Medium (Standard)Ingredients: Linseed oil + turpentine + white spirit.Function: It thins the paint for better flow without breaking the oil bond. It makes the paint "short" (brush strokes remain visible).Resin-Free: Unlike many other brands, this contains no resin. It is just oil and solvent. This means it will not add gloss; it purely adjusts consistency.Quick Drying Painting MediumThe "Speed" Agent: Similar to the standard medium but includes a safe siccative (drying agent).Behavior: It speeds up the drying time significantly but does not turn into a jelly like Liquin (Alkyd). It stays fluid.Finish: Reduces gloss (semi-matte).Best For: Underpainting or artists working on a tight deadline who prefer natural oils over alkyds.3. Solvents & VarnishesRectified TurpentineSource: Distilled from pine resin (from Portugal/Indonesia).Quality: "Rectified" means it has been distilled multiple times to remove the sticky gum residue that cheap hardware store turpentine leaves behind.Smell: Strong, traditional pine odor.Dammar VarnishThe Traditionalist: Made from natural Dammar resin dissolved in turpentine.Finish: High gloss.Warning: It yellows with age and becomes brittle. It is strictly for the "Old Master's" look.New Masters Varnish (modern)The Update: A synthetic ketone resin varnish.Benefit: It is non-yellowing and flexible (unlike Dammar) but reversible with mineral spirits. Available in Gloss, Satin, and Matt.4. Summary Comparison: Old Holland vs. modern brandsVs. Gamblin: Gamblin uses Alkyds (fast drying synthetic resin) and Gamsol (odorless solvent). Old Holland uses natural oils (slow drying) and turpentine (strong odor).Vs. Winsor & Newton: W&N refines their oils chemically to be clear. Old Holland Sun Bleaches them naturally.Summary ChecklistSun Bleached Linseed: Pale / Traditional / Vermeer style / Best for whites.Windmill Linseed: Golden / Strongest film / Best for grinding paint.Poppy Oil: Clear / Very slow dry / Weak film / Best for pale glazes.Quick Dry Medium: Oil + solvent / No resin / Best for underpainting.Rectified Turpentine: Pine source / Strong odor / Traditional solvent.

Schmincke (Germany, est. 1881) is a brand defined by precision chemistry and resin.Crucial context: Their flagship oil paint, "Mussini," is not just oil paint; it is a resin-oil color (based on historical Italian formulas using Dammar resin). Consequently, their medium system is arguably the most sophisticated in the world, specifically designed to manipulate "resin-oil" balance. While other brands give you "fat" and "lean," Schmincke gives you precise numbered formulas to control gloss, drying, and refraction.1. The "Mussini" Series (The Numbered System)The core professional system. These use a precise balance of Alkyd/Ketone resins to match the Mussini paint line.Mussini Medium 1 (Thinner / Lean):Function: The "underpainting" medium.Chemistry: Safflower oil + synthetic resin + mineral spirit.Behavior: It thins the paint like turpentine but leaves a reinforced resin bond so the underpainting doesn't look "starved" or chalky. It keeps the paint lean.Best For: First layers and sketching.Mussini Medium 2 (Retarder / Fat):Function: The "open time" medium.Chemistry: High oil content + resin.Behavior: It slows down drying significantly. It creates a "fat" high-gloss film that is elastic and durable.Best For: Wet-on-wet blending and final layers where you need time to smooth out gradients.Mussini Medium 3 (Accelerator / Gloss):Function: The "speed & shine" medium.Chemistry: High resin content + siccative (drying agent).Behavior: It makes the paint dry faster and dry glassy. It increases the "depth" of dark colors (refractive index).Best For: Glazing and artists who want a varnish-like finish immediately.2. The "Medium W" (The Game Changer)Schmincke is the world leader in "water-mixable" chemistry. This medium makes ANY oil paint water-soluble.The Concept: Instead of buying special "water-mixable oil paints" (like Winsor & Newton Artisan), you buy this bottle and mix it with your existing professional oils (Old Holland, M. Graham, etc.).The Chemistry: It wraps the oil molecules in a surfactant that allows them to mix with water.Liquid W:Texture: Fluid.Use: Mix 2 parts paint to 1 part medium. Use water to clean your brushes and thin the paint.Gel W:Texture: Heavy gel.Use: Designed for impasto. It keeps the paint stiff while still allowing water cleanup.Finish: It dries waterproof. Once the water evaporates, the oil oxidizes normally.3. The "Rapid" Series (Alkyd)Schmincke’s answer to Liquin.Rapid Medium:Chemistry: Alkyd resin + solvent.Function: Cuts drying time in half.Finish: Semi-gloss.Comparison: It is slightly more fluid than Liquin Original, making it easier to mix into the paint without creating "drag."4. Specialty Pastes & GelsSchmincke excels at modifying texture.Megilp (50 034):History: A modern recreation of the 19th-century "Maroger" or "Megilp" mediums.Texture: A gelatinous paste.Behavior: When you brush it, it turns liquid (thixotropic). When you stop brushing, it "freezes" in place. This allows you to create crisp brush marks that don't slump.Cold Wax Medium:Finish: Dead matte.Use: Mix with oil colors to create a thick, frosting-like texture that has zero shine.5. Summary ChecklistMussini Medium 1: Thinner / Lean / Best for underpainting.Mussini Medium 2: Retarder / Fat / Slow dry / Best for blending.Mussini Medium 3: Accelerator / Gloss / Fast dry / Best for glazing.Medium W: Water-soluble adapter / Eco-friendly / No solvents.Rapid Medium: Alkyd / Fast dry / General purpose.Megilp: Gel paste / Thixotropic / Best for Turner-style effects.

Sennelier (Paris, est. 1887) is the historic paint house of the impressionists (Cézanne, Monet, Picasso). Their chemistry is defined by one obsession: Light.Crucial context: While most brands (Winsor & Newton, Gamblin) build their lines around linseed oil, Sennelier builds theirs around safflower oil. Safflower oil creates a film that is less strong than linseed but yellows significantly less, ensuring the "Impressionist Light" remains pure for centuries.1. The "Green For Oil" Line (The Eco-Revolution)Sennelier’s modern answer to the toxicity of oil painting.The Concept: A full system of mediums and solvents made from biosolvents (derived from grain, plants, and vegetable oils) rather than petroleum.Safety: They are non-toxic and biodegradable. Unlike turpentine, they do not emit harsh fumes, making them perfect for apartment studios or artists with allergies.The "Travel" Hack: Because they have a high flash point (they don't explode easily), they are one of the few solvents some airlines may allow in checked luggage (though always check specific airline rules).The Products:Green Thinner: Replaces turpentine.Green Gel Medium: A texture gel for impasto that improves drying time.Green Liquid Medium: For glazing and improving flow.2. The Traditional Mediums (The "Turner" Series)Historical formulas designed for the glazing techniques of the Old Masters.Turner Painting Medium (The Jelly):Base: Dammar gum.Texture: Jelly-like.Behavior: It is "thixotropic"—it sits in the jar as a gel but liquifies when you brush it. When you stop brushing, it sets up again.Finish: High gloss. It adds the deep, vitreous "museum finish" to a painting.Best For: Glazing and artists who want their brushstrokes to stay crisp without slumping.Universal Medium:The "Standard": A balanced mix of resin and oil.Use: The "do-it-all" fluid. If you don't know what to use, use this. It helps paint flow, adds a bit of gloss, and speeds drying slightly.Courtrai Drier (Siccatif de Courtrai):The "Nuclear" Option: This is a powerful drying agent based on zirconium and calcium (formerly lead).Action: It creates a chemical reaction that forces the oil to oxidize rapidly.Warning: Use drops, not pours. If you add more than 2-3% to your paint, the film will crack and wrinkle. It turns oil paint dry in ~12-24 hours.3. The Pure OilsClarified Safflower Oil:The Flagship: This is the exact oil Sennelier uses to grind their tube paints.Benefit: Non-yellowing. Use this for whites, pale blues, and skin tones.Trade-Off: It dries slower than linseed oil and forms a slightly softer film.Clarified Poppyseed Oil:The "Slow" Oil: Even paler than safflower.Behavior: Extremely slow drying (can take weeks to cure).Best For: Wet-on-wet blending that needs to stay open for days.4. Summary ChecklistGreen for Oil: Non-toxic / Biosolvent / No smell / Best for home studios.Turner Medium: Dammar jelly / High gloss / Thixotropic / Best for glazing.Courtrai Drier: Strong siccative / Ultra-fast dry / Use sparingly / Best for deadlines.Safflower Oil: Non-yellowing / Medium dry / Best for whites & pastels.Poppy Oil: Clear / Very slow dry / Best for blending.

Utrecht Art Supplies (Brooklyn, USA) is the "working artist's" brand.Crucial context: Utrecht was originally a paint mill started by artists (the Gulamerian brothers) who wanted professional quality without the "Old Master" markup. Their mediums are famous for being straightforward, chemically robust, and manufactured in the USA. While they are now owned by Blick, the medium formulations remain distinct: they are designed to handle the heavier, stiffer body of Utrecht oil paints.1. The Alkyd Series (The Speed System)Utrecht was one of the first American brands to popularize alkyd resins as a standard studio tool.Alkyd Glazing Medium (Liquid)Function: The "Liquin" alternative.Chemistry: Oil-modified alkyd resin + Solvent.Behavior: It speeds up drying significantly (touch dry in ~24 hours). It is fluid and reduces the viscosity of the paint for long, sweeping strokes.Finish: High gloss. It creates a tough, flexible enamel-like skin.Best For: Glazing multiple thin layers quickly without waiting days for them to dry.Alkyd Gel Medium (Tube)The "Impasto" Speed Agent: This is a heavy-body gel, not a liquid.Behavior: It speeds drying without making the paint runny. You can mix this into heavy mounds of paint to make them dry faster while keeping the sharp peaks of your brushstrokes.Thixotropic: It feels stiff until you work it, then it relaxes.Best For: Thick, expressive painting that needs to dry overnight.2. The Traditional MediumsClassic formulas for artists who prefer the smell and feel of turpentine and dammar.Classic Oil Painting MediumIngredients: Linseed oil + Dammar varnish + turpentine.The "Old School" Mix: This is the pre-mixed version of the classic "1/3 oil, 1/3 varnish, 1/3 turp" recipe.Behavior: The Dammar adds gloss and tack; the turpentine thins it; the linseed reinforces the film.Finish: Glossy and rich.Best For: General painting when you want that traditional sticky, resinous feel.Finest Linseed Oil (Alkali Refined)The Standard: Utrecht uses alkali refining (a chemical process) to remove impurities.Color: Pale straw yellow.Acid Value: Lower than cold-pressed oil, meaning it is less likely to yellow over time.Best For: Extending color and making your own paint.Stand OilThe Leveler: Polymerized linseed oil (thick like honey).Finish: Enamel gloss.Behavior: It levels out brushstrokes completely. If you want a mirror-smooth surface with no texture, this is the medium to use.3. The Solvents (NOOD)Utrecht’s answer to Gamsol.NOOD (No odor)Product: Odorless paint thinner.Chemistry: Highly refined petroleum distillate with aromatic solvents removed.Flash Point: High (safer than turpentine).Performance: It evaporates slower than turpentine, giving you more time to work, but it has zero smell.Best For: Cleaning brushes and thinning paint in unventilated studios.Gum Spirits of TurpentineThe Real Deal: Distilled from pine trees.Odor: Strong pine.Power: Stronger solvent than NOOD. It will dissolve Dammar crystals (NOOD will not). Use this only if you are making your own varnish or specific traditional mediums.4. Summary ComparisonAlkyd Glazing Medium: Fluid / Fast dry / High gloss / Best for layers.Alkyd Gel: Heavy gel / Fast dry / Retains texture / Best for impasto.Classic Medium: Linseed + Dammar / Resinous feel / Traditional.NOOD Thinner: Odorless / Slow evaporation / Safer studio.Stand Oil: Honey-thick / No brushstrokes / Enamel finish.

Winsor & Newton (London, est. 1832) is arguably the most ubiquitous paint brand around. Their medium system is massive, chemically precise, and centers around one product that changed the industry forever: Liquin.Unlike boutique brands (Old Holland) that rely on simple oil/turps mixtures, W&N relies heavily on alkyd resin technology to solve the modern artist's need for speed.1. The "Liquin" Family (The Alkyd Revolution)If you only know one oil medium, it is likely Liquin. It is a semi-solid alkyd gel that speeds drying and smoothes flow.Liquin Original:Texture: A thixotropic gel (gloppy in the bottle, fluid when brushed).Function: Halves the drying time of oil paint (touch dry in 24 hours).Finish: Glossy. It is famously "warm" (slightly amber), though modern formulas are paler.Best For: General painting, glazing, and artists who want their painting dry by the next morning.Liquin Fine Detail:Texture: Fluid (like water/milk). It is not a gel.Function: Self-leveling. It removes brush marks completely.Best For: Fine detail work, smooth glazing, and invisible brushwork (e.g., painting hair or eyes).Liquin Impasto:Texture: Stiff gel.Function: It adds bulk to the paint without making it runny. You can build huge peaks of paint that dry overnight.Best For: Knife painting and textured effects.Liquin Light Gel (Oleopasto):Texture: A lighter, non-drip gel.Function: It breaks down the paint less than Original Liquin, keeping the color bold and high-viscosity.2. The Traditional OilsW&N offers standard oils, but with industrial refinement.Refined Linseed Oil:The Standard: The most popular painter's oil in the world.Chemistry: Alkali refined to remove impurities.Behavior: Dries in 3-5 days. Forms a tough, durable film. It is the safest bet for general painting.Cold Pressed Linseed Oil:The Premium: Extracted without heat.Difference: It has a higher acid value and wets pigment better than refined oil. It is slightly more yellow but forms a stronger film.Best For: Grinding your own pigment.Thickened Linseed Oil (Stand Oil):The Leveler: Polymerized oil (syrup consistency).Use: Reduces brush marks and adds enamel-like gloss.Drying Poppy Oil:The Pale One: Made from poppy seeds.Benefit: Non-yellowing.Trade-Off: Very slow drying (unless modified with driers).Best For: Whites and pale blues.3. The "Artists' Painting Medium" (The Classic)Product: Artists' Painting Medium.Chemistry: A "slow-drying" alternative to Liquin. It is a mixture of stand oil and solvent.Behavior: It makes the paint flow beautifully (like melted butter) but does not speed up the drying as aggressively as Liquin.Best For: Traditional wet-in-wet painting where you want the paint to stay open for a few days.4. Solvents (Sansodor)Sansodor:Product: Low-odor solvent.Chemistry: Petroleum distillate with harmful aromatics removed.Comparison: Similar to Gamsol. It evaporates slowly and is safer than turpentine.Use: Thinning paint and cleaning brushes.Distilled Turpentine:The Strong Stuff: High solvency pine spirit.Use: Only necessary if dissolving Dammar resin or creating heavy-duty varnishes.5. Summary ChecklistLiquin Original: Alkyd gel / Fast dry / Glossy / Best for general speed.Liquin Fine Detail: Fluid / Self-leveling / No brush marks / Best for detail.Liquin Impasto: Stiff gel / Fast dry / Retains texture / Best for knife work.Refined Linseed Oil: The standard / Medium dry / Durable film.Sansodor: Low odor solvent / Safer studio / Best for thinning.