Re: Casein Opacity?
Casein can be tricky to figure out at first. I wouldn't say that you can't use them transparently, but they are definitely on the more opaque and brighter side of things. They brighten up even more than gouache. Like Trikist mentioned, you're likely to use black more often than in other media. I recommend having a test sheet of paper next to you, to check out how colors look when dry.