I have heard that you can treat this problem with what is called a bright
If memory servers me correctly, Bright Dip is a lethal concoction
created from roughly equal portions of nitric, hydrochloric, and
sulphuric acids, and is used for *dip polishing*. (triple yeach!!!)
Phosphoric acid is used as a pickling solution (must be HOT) and is
preferable to the usual sudium bisulphate solutions for silicon bearing
alloys. It makes silver ultra white. Phosphoric acid is in Coca Cola
etc... You could order some through you local drug store, or better yet,
through a chemical supply company (like Van Waters and Rogers). It's a
bit expensive ($20 a pint?) but it'll work for you.
As I don't use it, I can't tell you the proper concentration, though
someone told me 50%, I'd personally try some very small tests to
Hope this all helps...
I contains phosphoric acid, which reduces the copper oxides
and other copper gunk to something that will flake off with a little bit of
abrasion. Does this stuff work? Where can I get it? Any warnings or
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