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I goofed. Bismuth was the one I was after.

Anytime my northern neighbor.

Actually didn't look for a date of last reply. Saw a question I had an answer to. Thanks for the rude response though.

Current import limitations on UK import lasers completed and marketed a "pointer" is 1mW. US import limit is 5mW. However, the sky is the limit for separate parts.

If that is copper, that almost certainly isn't corrosion. There are very few acids hat can disrupt the bonds of precious metals. The acids that can are EXTREMELY dangerous. Also, since the OP said the disturbance seems to move, that suggests an organic compound of some sort. Again, if that is...