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Is it true that bat guano was, at least, once used in making mascara? If so, how common is it today? - Quora
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Is There Actually Bat Poop In Mascara?! The Answer Might Shock You...
Urban legend talks about the use of bat guano as an ingredient in mascara. It's actually guanine, an authorized c… | Mascara, Cosmetics, Beauty products photography
Is There Actually Bat Poop In Mascara?! The Answer Might Shock You...