![Urban legend talks about the use of bat guano as an ingredient in mascara. It's actually guanine, an authorized color addi… | Mascara, Cosmetics, Makeup photography Urban legend talks about the use of bat guano as an ingredient in mascara. It's actually guanine, an authorized color addi… | Mascara, Cosmetics, Makeup photography](https://i.pinimg.com/originals/c9/d3/df/c9d3dfb27af7849b822d8e1c4e08b276.jpg)
Urban legend talks about the use of bat guano as an ingredient in mascara. It's actually guanine, an authorized color addi… | Mascara, Cosmetics, Makeup photography
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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 Is it true that bat guano was, at least, once used in making mascara? If so, how common is it today? - Quora](https://qph.cf2.quoracdn.net/main-qimg-44f25a4c78e3d56960b87ff358291d4b.webp)