If you are unfamiliar with gouache (pronounced GWAHSH), it is typically described as an opaque watercolor, although when diluted with water, it can be used transparently, as well. As with traditional watercolor, it doesn't dry waterproof, so be aware that if you paint over it, you could activate the dried layer if you use enough water. This can be great, as it makes the colors blend easily and gives you the ability to soften edges and spread color. It can also be annoying, of course. Be careful not to get drips or spatters of water on the dried paint surface, as this can create spots.
The opacity enables you to use the paint on dark surfaces, though, which can create interesting results. I painted this nighttime scene of my bedroom with white gouache on black bristol board. I especially like the reflection of the edge of the pillow against the night-darkened window glass. That kind of effect would be harder to achieve with a different medium.
Gouache paint dries matte, like that tempera paint you probably used in grade school. The two paints actually look very similar in their finished state, but tempera dries permanent and gouache is rewettable/reworkable, as we've discussed. The paints have different binders – traditionally, egg yolk for tempera and gum arabic for gouache. There is also a type of gouache called acrylic gouache that dries permanent, like acrylic paint. I prefer workable gouache, since I already work in acrylic and can use that if I want a more permanent finish.
Gouache has been around for quite a long time, but it was considered more of a designers' medium (that is, more for advertising and design layout sketches than for finished pieces - even my painting above was just a tonal study for a larger piece). However, it's been getting a bit of a renaissance lately, via art YouTube channels, since it is colorful, fun, and easy to use. I have been getting back into it myself and really enjoying it! I bought myself a set of Miya's HIMI jelly gouache and am in the process of posting some reviews of it showing the different colors and a gouache painting in progress.
For the initial unboxing: https://allsortsartbyali.blogspot.com/2023/03/unboxing-himi-jelly-gouache-24-color-set.html
The reviews start here: https://allsortsartbyali.blogspot.com/2023/06/himi-jelly-gouache-color-review-1-sky.html
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