In my graphic design work I’ve gotten to know scratchboard (aka clayboard.) It’s a very cool material that I’ve had a lot of success with. Here’s an early example.
Here’s a pretty good rundown of many of the tools, materials and techniques for working with clayboard. I found it very informative.
Pito Salas' Blog 
How’s it going – This is a great placeJust registered and wanted to say hello.
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