I've wedged various oxides into white clay to "marble" it, which is similar. Basically I just sprinkled a little onto already-wedged clay, and then wedged a little more to distribute the color & threw normally.
It's a powdered stain, Deb. I bought some at our ceramics supply store - they have tons of colors - and I want to experiment with colored slip. Thought I might as well try coloring some clay, too, since I have a good amount - I think it's called teal.
Does it stain your hands at all, or is it pretty much wash-off? What kind of amounts are needed to color slip (using a light colored clay)? Is it "what you see is what you get?"
Mason stains are a wysiwyg (what you see is what you get). To get a saturated color you need a lot of stain and that will change the compensation of the clay so don't plan on a dark color. I use mason stains for terra sig and to mix liquid stains. They are the same thing that masons us to color grout. To get a good red or orange t is best to use encapsulated mason stains. I am sorry I can't tell you what is encapsulated about them.
Kasper, I haven't been able to make canes like folks do with polymer clay...the texture is just wrong and the clay too sticky. I'm thinking that maybe if I experiment with allowing the clay to dry out a little prior to working with it I may have more success. Right now I'm working on a bowl made out of various marbled / stained clays - it's leather hard and I filled the small areas between the pieces with a different colored slip. Don't know if it will make it through the drying process but will let you know.
Well, doesn't look like much right now. Once it dries I'll go over it with some sandpaper (wearing a mask of course :) ) and that will make the pieces more defined. I also want to do more to texture the outside...not sure what yet.