I’m on a gouache kick. I’m waiting for a set of acrylic gouache, and in the meantime, I’m using the Winsor and Newton set I bought a few years ago to remember the qualities of it.
It’s vibrant but dries matte, reworks easily with a little water, and is opaque so you can paint lights over darks. It’s very similar to casein, but casein dries fairly permanently after a period of time.
There are a lot of similarities with Neocolor II crayons, one of my favorite mediums. I’m looking forward to trying the Liquitex Acrylic Gouache set, however, as it dries permanently.