"Harold and Susan Vordos" wrote in message
...
I believe that stained glass workers commonly use a copper sulfate
solution
to deposit a thin copper film. I don;t have any details.

That won't work on silver solder.

Copper sulfate will work on ferrous materials. Cupric chloride works on
less electromotive metals, up to and including lead.

Use a heavily copper-bearing silver solder, and you won't have to cover the
joints. They'll look like they were fusion welded.

LLoyd