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We restore pot metal parts for antique cars and other things. After grinding the metal and polishing it and filling in whatever pits can't be removed with silver solder there are still white looking spots commonly referred to as "dead spots". We clean and activate in diluted Sulfuric acid, Cyanide copper plate, and Acid copper plate. Then we take it back to the buffing room and buff. The white spots or "dead spots" will bubble and blister. These spots do not occur in all pot metal only in select pieces. We have tried Fluoboric Acid with a 20% solution. I need to know if there is a way to activate these spots without all the drilling and filling which is very time consuming. And if anyone knows exactly what these spots are please let me know.

Thanx in advance


Barbey Richardson
- Wellford South Carolina

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