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Donkey-hide gelatin or ass-hide glue (Latin: colla corii asini) is gelatin obtained from the skin of the donkey (Equus asinus) by soaking and stewing. It is used as an ingredient in the traditional medicine of China,[1][2] where it is called ejiao (simplified Chinese: ; traditional Chinese: ; pinyin: ē jiāo).

A slab of donkey-hide gelatin
The donkey or ass

The gelatin is produced in several coastal provinces of China: Jiangsu, Zhejiang, Shandong. Shandong's Dong'e County was where "ejiao" got its name.

According to a ca. 1723 account by the French Jesuit Dominique Parrenin, there was a well in Dong'e which was normally kept closed and sealed, and which was only opened when water was taken to be used in preparation of ejiao for the emperor's court.[3]

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