I'm looking for some clay bodies that are DARK. I have an idea in mind, and I'd like to have a clay as dark as something like cassius basaltic clay. But I've seen that it's SO finicky, and a lot of people have their glazes crater on that clay. I would like to achieve this kind of contrast between my clay and glaze: Sorry for the blur. Does anyone know of a reliable, tested clay body that is dark chocolate or near black, and fires to cone 6? *I know these clays can someti