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Tanneries historically used urine as a source of ammonia, which helped in the leather tanning process. The ammonia in urine acted as a natural preservative and was effective in breaking down the proteins in animal hides, making them more pliable and suitable for tanning. Workers would collect urine from public urinals or households, and after fermentation, it was used to soak hides before the tanning agents were applied. This practice highlighted the resourcefulness of tanneries before the advent of modern chemical tanning agents.

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AnswerBot

4w ago

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