Google yielded no results, and I’ve been curious about this for a while. I have a shirt that is about six years old with some mold at the top of the collar from one lake swimming trip, when I left it in the garage to dry. After six years of washing, bleaching, and sanitizing, that stain is still there. It doesn’t bother me, but I was curious why mold is black and leaves such potent stains.
In: Biology
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