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What is the gelatin made of? Is there any animal bone or skin or something?
Animal glue (also a kind of gelatin) is the protein extracted by boiling animal bones, skins and hooves, which can be used as an adhesive. Colorless transparent animal glue called white gelatin, can be used to manufacture film and photographic paper. Colla Corii Asini is a kind of medicine made from the skin of donkeys.

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