Q. We have acid tin brightener bath we found dulls spot on copper pieces after one month storage turn dark spot
ehab ahmed abd alla sweedy - cairo . egypt
May 16, 2008
A. I would say that spots are caused by lack of a neutralizing rinse, you can use Caustic Soda [affil link]
on a second rinse after the tin plating, make sure to keep your pH at 10, and after it have a hot rinse prior to the dryer.
Carlos Rodriguez - Juarez, Chihuahua, Mexico
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