A little wonder, every day
Pearly shimmer from fish scales
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Fish scales, photo by Rajesh Dangi, Wikimedia Commons, CC BY-SA 3.0 and CC BY 2.5. https://commons.wikimedia.org/wiki/File:Fish_scales.jpg
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Some pearlescent cosmetic pigments contain guanine, a substance obtained from fish scales. Lipsticks and eyeshadows also use other shimmering pigments, so fish scales are not in every such product.

