>>6016972It's essentially opaque watercolor. The good brands like Winsor Newton, Holbein, M. Graham, Schminke use opaque pigments and less gum arabic (medium) to achieve their opacity.
Shitty gouache has chalk in it to get opaque.
Gouache has a matt finish, the lights dry darker and the darks dry lighter, you need to use a black on your palette to achieve the darkest darks (unlike oil for example where people might avoid using black).
Gouache can be rewet at any point to blend and mix again. This means you should put down a brushstroke and leave it or you risk picking up previously dry layers underneath and getting unintentional mixes.
But it also means you can work in a hard edge "tiling" method, then come back later with pure water in your brush to blend out soft edges.
It's pretty cool but can be confusing if you don't have experience. Even just the amount of water you use can turn your gouache into effectively transparent watercolor. To little water and it feels too thick to paint properly.
