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Sulfuric Acid turned brownish color

When I first purchased the acid it was clear in color, I used about 5 gallons and then sealed it up. Over several months the acid has turned brown in color.

What happened?

My tank is plastic.

I know the brown acid you aren't supposed to use. I called up the company I purchased and they said it was 93% or better and the brown color is just a reaction with the oxygen in the air.

(the reason I am asking is because when I anodize I get a matte finish toward the edges of the parts)

Garrett Pyros
hobbyist - Tampa, Florida
February 5, 2010

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