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Tin plating turns black after 5 to 6 months

we are having the tin plating shop major we do on brass metal parts, we had observed that after 5 to 6 months those tin plated parts are becoming black, can you solve my problem

Sudheer Kumar
engineering - India
February 2, 2010

You may want to check out letter #5106.

Mark Baker
Fellow Plater - Syracuse, NY USA
February 3, 2010

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