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Why is Potassium Thiocyanate used in Copper Cyanide Bath?

Please, can somebody tell me why some Copper Cyanide baths use a small amount of potassium thiocyanate [affil links]?

Jiri Samuel
Plating shop - Huntington Beach, California, USA
April 5, 2011

It acts as a brightener but do not use without working out how much to use from Hull Cell tests

Geoffrey Whitelaw
- Port Melbourne, Australia
April 11, 2011

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