Introduction To Gouache

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Gouache is essentially "opaque watercolor." It uses the same binder (gum arabic) but has a much higher pigment load and larger particles (or added chalk) to make it opaque.

The Good: It dries to a beautiful, velvety matte finish that scans perfectly. Unlike watercolor, you can paint light over dark. Unlike acrylic, you can re-wet it after it dries, to blend.
The Bad: The "Color Shift." Darks dry lighter, and lights dry darker. It takes practice to match colors.
The Goal: Master the "creamy" consistency so the paint flows smoothly without cracking.

The First Decision: Designer vs. Acrylic Gouache

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.


The Palette: The "split primary" + big white

You need a lot of white to make pastels and opaque mixes.

The Essentials:

  1. Permanent White (Titanium): Large tube. This is your opaque, covering white.

  2. Lemon Yellow: The "cool" yellow.

  3. Yellow Ochre: Gouache is famous for earth tones; this is essential for landscapes.

  4. Flame Red (or Cadmium Hue): The "warm" red.

  5. Alizarin Crimson: The "cool" red.

  6. Ultramarine Blue: The "warm" blue.

  7. Primary Blue (or Cyan): The "cool" blue.

  8. 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.


The Brushes: Synthetic flats

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.


Surfaces: Paper Only

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.

Mixed Media Paper: 
  • Acceptable for sketchbooks, but heavy washes might buckle the paper.


Consistency: The "Tea to Butter" Scale

Water control is everything in gouache.

  1. Tea: Very watery. Use this consistency only for staining the white paper initially.

  2. Milk: Flows easily but has color. Good for large washes.

  3. 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.

  4. Butter: Straight from the tube. Use only for final highlights (impasto). Warning: If painted too thick, it will crack/crumble off the page.

The Color Shift Warning
  • 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.


Beginner's Shopping List

Walk into the store and grab these items.

The paint:

  1. Permanent White (Large tube - 37ml)

  2. Primary Yellow

  3. Primary Red

  4. Primary Blue

  5. Ivory Black

  6. Burnt Sienna

The Tools:

  1. Brushes: Size 8 synthetic flat, Size 4 synthetic round.

  2. Surface: Hot Press Watercolor block (smooth).

  3. Palette: Ceramic or porcelain plate (Plastic stains badly with gouache).

  4. Spray Bottle: Essential to keep your paints from drying out on the palette while you work.