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Sorry Rochelle, I don't really know about how fine the powders need to be. My experience with the marble dust is that it creates a very absorbent ground - thereby I can extrapolate that most such powders will cause a certain amount of oil absorbtion. It sound like a great experiment to me, so if you have a chance to do it, please let the rest of us know what you find.
Hey, you don't suppose that they ground the powdered pigments in a quartz mortar and pestle do you? Could that be the source of the quartz in the paint? Also, how about the muller he used? Was it stone or glass? Could it be the source of the minerals in the paint? We may never know for sure....
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