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302 passivated stainless steel turns black

I have 304 and 302 passivated stainless steel bolts that turn black, but not all the time.
Any reason for the inconsistency?

Greg Stoermer
Restorer - Milwaukee, Wisconsin
November 30, 2010

December 16, 2010

Greg,
Probably, but without more information from you it's hard to hazard a guess. How quickly do they turn black and what chemicals are they exposed to?

Ray Kremer
Stellar Solutions, Inc.

McHenry, Illinois

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