Not quite gouache, not quite acrylic, not water(color) and not oil... I'm trying Casin paints. Actually anybody who know me would say, " It's just another excuse to start a new sketchbook." I must admit... I was romanced by the paper (and format) before I took up the paints; the secret's out! This particular sketchbook I am doing quick studies of flowers- fun! Since this is my 2nd attempt to paint in the medium, the verdict is still out as to whether I plan to adopt this medium into my artistic arsenal.