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Possible contaminants in sulphuric acid

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RisingEastStar17:
I siphoned some sulphuric acid from a car battery and foolishly decided to distil it to concentrate it. However, when I did so, it turned a very dark bluish-green sort of colour. The question is, what would be the possible contaminants in this acid?

Hunter2:
Lead, copper, iron, I guess

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