Is it that cats have more stuff in their urine than anybody else, because I used my urine on a few pieces and turned a nice pale blue.

warren

I don't know, maybe. It's just that I do alot of work for a conservator, from Greece, and he tells me these little secrets from time to time. I wonder, if you took a sample piece of copper, put it on the bottom of a cat box, if that would give you a measure to go by. But, then again,circa 1972: my dad had access to the tigers at the Detroit Zoo, but he wasn't into patinas if you had access to a zoo,...

Don T.