Glue is often made from animal products. The best glues are made from “fresh bones, freed from fat by previous boiling, the clippings and parings of ox hides, the older skins being preferred; but large quantities are also get from the skins of sheep, calves, cows, hares, dogs, cats, etc., from the refuse of tanneries and tanning works, from old gloves, from sinews, tendons and other offal of animal origin.” For more on how glue is made from these parts check out the website in the citation field below.
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