Are you plating Nickle under the Gold?

If not, then your Gold is porous, and you are getting tarnish, and the oxide
occupies more space than the metal, and thus it has grown on to the surface.

You also are using the wrong photoresist stripper, if that is the case, as the
stripper should not tarnish the Copper, no matter what.

If you need a source of photoresist stripper that simply will not tarnish
Copper, no matter what, contact me directly, off Technet, please.

Rudy Sedlak
RD Chemical Company

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