please help!!
when i left a piece about 10 min on my caustic soda i had this great mate finish, but i wanted to try a bright finish, so i didn't left the piece in the caustic soda a lot of time, and i saw that in my ano tank it started to grow little black spots and it ended up looking like this. it is only in the teeth, have no idea what i did wrong.
acid 1:3
temp 20C
.7mil
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