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Brass comes out dirty after pickling

I made some brass earrings. Cut them out of sheet, hammered them on
steel block, annealed a couple of times, and then put them into
pickle mixture of alum and water. Left them in for a couple of hours
and when I took them out they had some dark areas that I have to
clean off. I don’t get it? Can someone tell me what it could be. I
thought the pickle would have left the bras sparkly clean.


I can’t answer this too well because I like patina, but I have seen
this happen too. Try cleaning the brass with Bar Keepers Friend, and
a green scrubbie.

Roxy Lentz