Yes, the red oxide is cuprous and the black is cupric.
I must have missed the email on copper depletion.
I wonder if we should move on to a discussion of our Multi-Etch
product. It contains no acid yet will etch titanium, niobium,
copper,zirconium, tool steel and we are about to get information
from the maker of uses with platinum. It will remove light fire scale
from sterling. Are there users out there with other uses? Bill
Bill, Deborah, Michele & Sarah
Reactive Metals Studio, Inc
928-634-3434, 800-876-3434, 928-634-6734fx