Re: Powdered pigments?
I studied in the early 70's with a guy named Jack MacDonald, then in his late 60's and who had taught at the Mortensen School in Laguna Beach Ca. Jack said Mortensen used to buy the little tins of water colors at the dime store and grind them up in a mortar and just add water and dichromate to make gum prints. Jack said the tins of colors used gum arabic to make the pigment cakes and that was enough gum to make a print. I suspect the same is true of W&N cakes, but then maybe not.
Ok, you ask -- what's a dime store?