I have been working with some brass and the curse of the pink stain has meant a lot of scrubbing and sanding. I had remembered a super pickle that Dennis French had told me about but I could not find my notes.
Yeah! I found a source and wanted to share it with you.
Super Pickle for Removing Pink (copper skin) on Brass
Mix 2 parts hydrogen peroxide (3%) solution with the same amount of Sparex and 1 part water. Pickle first in plain Sparex then soak in hydrogen peroxide solution for 5 to 10 minutes to remove the pink skin often remaining on pickled brass. Exposure to sunlight will weaken the solution.
McCreight T. The Complete Metal Smith. (1991) Worcester, Mass: Davis Publication, Inc, p. 73
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I have used the above recipe for ridding brass of the pink or copper skin and it works really well.
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