Metal finishing Q&As since 1989
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Black smut on pewter from Nitric Acid oxidising
We are using diluted nitric acid to oxidise pewter. After nitric acid, parts go into baking soda [on
eBay or
Amazon]
solution to neutralize.
After drying and buffing, we cannot stop black coming out and staining the hands etc!
Is there any other solution we need to use to stop the staining?
thanks
manufacturer - Midlands, United Kingdom
February 23, 2011
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