Introduction To Gouache
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This is the #1 confusion point. These are two totally different mediums.
A. Designer Gouache (Traditional)
Binder: Gum arabic.
Behavior: It is re-wettable. Even after it dries, if you touch it with a wet brush, it will reactivate.
Pros: Infinite blending. You can leave dried paint on your palette and use it weeks later.
Cons: Hard to layer (the top layer can accidentally lift the bottom layer).
Verdict: Start here if you want the traditional gouache experience. (Brands: Winsor & Newton Designer, Holbein).
B. Acrylic Gouache (Acryla)
Binder: Acrylic polymer.
Behavior: It is permanent once dry.
Pros: Waterproof. You can layer fearlessly.
Cons: Dries instantly. Ruins brushes if left to dry. Cannot be reactivated.
Verdict: Choose this if you want the look of gouache (matte) but the durability of acrylic.
C. "Jelly" Gouache (The Social Media Trend)
What is it? Student-grade gouache kept wet in cups (Himi/Miya).
Verdict: Fun for sketching and very cheap, but often streaky and prone to molding if not cared for. Good for absolute beginners on a budget.
You need a lot of white to make pastels and opaque mixes.
The Essentials:
Permanent White (Titanium): Large tube. This is your opaque, covering white.
Lemon Yellow: The "cool" yellow.
Yellow Ochre: Gouache is famous for earth tones; this is essential for landscapes.
Flame Red (or Cadmium Hue): The "warm" red.
Alizarin Crimson: The "cool" red.
Ultramarine Blue: The "warm" blue.
Primary Blue (or Cyan): The "cool" blue.
Burnt Umber: For mixing darks.
Note on Zinc White: You might see "Zinc" or "Mixing" white. This is semi-transparent. Only get this if you want subtle mixing; otherwise, stick to Titanium/Permanent White for coverage.
Detailed guide available in the "Brushes" section.
Material: Soft synthetic.
Avoid: Rough hog hair (leaves scratch marks in the smooth paint) and expensive sable (the chalky filler in gouache ruins delicate natural hairs).
Shapes:
Flat/Bright: Gouache looks best with architectural, blocky strokes. A 1/2" flat is your main tool.
Round: For details.
Gouache is brittle. If you paint it on canvas, it will crack when the fabric moves.
Watercolor Paper (Hot Press)
Texture: "Hot Press" means smooth.
Why: Gouache artists usually prefer smooth paper so the texture doesn't fight the detail.
Weight: 300gsm / 140lb is required.
Acceptable for sketchbooks, but heavy washes might buckle the paper.
Water control is everything in gouache.
Tea: Very watery. Use this consistency only for staining the white paper initially.
Milk: Flows easily but has color. Good for large washes.
Cream (The sweet spot): The consistency of heavy cream or melted ice cream. It is opaque but flows off the brush. Aim for this 90% of the time.
Butter: Straight from the tube. Use only for final highlights (impasto). Warning: If painted too thick, it will crack/crumble off the page.
Dark colors dry lighter. (The water evaporates, leaving the chalky binder visible).
Light colors dry darker.
Tip: If you are trying to match a color you already painted, mix it on a scrap piece of paper and let it dry first to check the match.
Walk into the store and grab these items.
The paint:
Permanent White (Large tube - 37ml)
Primary Yellow
Primary Red
Primary Blue
Ivory Black
Burnt Sienna
The Tools:
Brushes: Size 8 synthetic flat, Size 4 synthetic round.
Surface: Hot Press Watercolor block (smooth).
Palette: Ceramic or porcelain plate (Plastic stains badly with gouache).
Spray Bottle: Essential to keep your paints from drying out on the palette while you work.

