> One more question: which would be a more effective
contrast control agent for use with vellum, potassium chlorate or
sodium dichromate?<
I've never tried vellum with potassium chorate, but I would way with
its tendency to show mottling, I would avoid chlorate like the
plague.
I had good luck with sodium dichromate. I haven't used chlorate in a
couple years.
Kerik