Gouache Paint

Image source: https://shariblaukopf.com/2022/08/13/gouache-on-panel/
Pan of mixed paints
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Unique Properties

In traditional gouache, pigments are ground up into a powder, but not as finely as watercolor. The larger pigment particles are still very fine to a human eye but are larger than what is used in watercolor paint. The pigments are combined with a binder, typically gum arabic. More pigment is added, which is often why it’s referred to as having a ‘heavy pigment load.’ Sometimes other binder ingredients are added such as dextrin (starchy glue), ox gall, honey, and calcium carbonate.

Close view of the texture of gouache
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Behavior

When gouache dries is it not permanent in the same sense as acrylics. Gum arabic is a strong natural adhesive, so the pigment is held to the paper fibers tightly. But it’s water-soluble, so the surface of gouache can be rewetted and moved. This can be one of the best features of gouache. Similar to working with oils, it’s able to continuously blend into existing colors. However it does take time to get used to this, just like with oils. Beginners may get frustrated by this trait. Some people like using an acrylic gouache underpainting to help.

Set of synthetic paint brushes
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Materials

Water control is important when painting with gouache. Synthetic flat brushes make it easier to control water content. Softer hairs are better for layering gouache. Stiff hairs can force color to blend with the layer below. Any paper above 90 lb / 150 gsm is fine, but the thicker the better. Thinner paper will buckle slightly with the moisture in gouache. Hot pressed paper is great for gouache because the paint is able to glide over the smooth paper easily. Rough paper can cause some “brush drag” and inhibit the ability to create super crisp lines

Popular Gouache Brands

  • Windsor & Newton Designer Gouache
  • M. Graham & Co. Artist’s Gouache
  • Shinhan Professional Designer Gouache
  • Holbein Artists’ Gouache
  • Schmincke Horadam Artist Gouache
  • Daler Rowney Designers Gouache
  • Daniel Smith Extra Fine Gouache
  • Royal Talens Extra Fine Gouache
Behavior Gouache Watercolor
Water reactivation Yes No
Translucent No Yes
Water based Yes Yes
Solvent needed No No