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Old April 11, 2013, 09:19 PM   #1
trobin
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Black tarnish?

How do y'all get the black tarnish discoloration out of brass?
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Old April 11, 2013, 09:26 PM   #2
serf 'rett
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Wet tumble with stainless steel pins is one way.
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Old April 11, 2013, 10:05 PM   #3
trobin
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Guess I shoulda been move specific. With a vibratory tumbler.
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Old April 12, 2013, 11:49 AM   #4
notlikeyou
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When you tumbled them did you use any additive to the media? (polish, simple green etc?)
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Old April 12, 2013, 12:20 PM   #5
Ambidextrous1
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Black tarnish can be removed by dry "tumbling" in a vibratory machine, but it takes longer than the ordinary discoloration characteristic of fired brass. As hinted in an earlier post, addition of a mild abrasive to the tumbling media will help.

I have learned to live with the occasional dark stains; I don't have the patience necessary for their complete removal. The stains will disappear after several trips through the vibrator.

Maybe someone will suggest a mild acid bath that will get rid of these stains in less than an hour...
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Old April 12, 2013, 01:54 PM   #6
TATER
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How about 3 min in CLR then rinse well. tumble after they are dry.
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Old April 12, 2013, 07:36 PM   #7
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I took some and soaked it in vinegar and salt for about 30.
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Old April 12, 2013, 07:38 PM   #8
trobin
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I added nufinish to the tumbler but didn't turn it back to brass color
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