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Tarnishing of copper versus zinc plated object

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Hello,

I was wondering if you knew a way to quickly and nticeably tarnish copper, versus a copper pipe that had been electroplated with zinc. I used electroplating to plate the copper pipe with zinc, and now I need to know how to tarnish an un-plated copper pipe, so I can compare it to my zinc coated pipe. If you could tell me, I would really appreciate it.

Thank you,

Max L.
student - Vancouver, BC, Canada

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