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Stripping Gold

We selectively strip gold from using a reel-to-reel process. Quite often, the gold that remains after the stripping process is a dark, brown-gold color. Do you have any suggestions for how to fix this problem?
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Q: We selectively strip gold from using a reel-to-reel process. Quite often, the gold that remains after the stripping process is dark in color similar to a brown gold. We have tried a number of different formulations with little success in solving the problem. Do you have any suggestions? M. T.

 

A: The dark color may be caused by impurities that build up in the stripping solution. I assume you are using a cyanide based stripping solution. This type of solution tends to form dark polymeric-like materials as they age. The dark color could be a residue that is deposited on the surface during the stripping step. Temperature may also play a role here. A higher temperature may cause discoloration.
 

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