Are Horse Parts Really Used to Make Glue or Is That Just an Icky Rumor?

This answer attempts to help a teacher with a sticky situation involving glitter and a roomful of 8-year-olds.

Animal glue - Wikipedia

Is Glue Made From Horses? All You Need To Know

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Do they really send horses to the glue factory? - Quora

Your Complete Guide To PVA Glue Gathered Gathered

What part of a horse is used for glue, and when did this originate

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Do they really send horses to the glue factory? - Quora