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Warpy

(114,525 posts)
1. Pee was so important in the ancient world that Rome levied a tax on it.
Sun Mar 8, 2015, 07:39 PM
Mar 2015

Laundries/fullers used fully ripened urine to remove grease stains from clothing and linens, the high ammonia content being a potent degreaser before soap was invented. It was also an important part of the dyeing industry and absolutely essential to indigo dyeing.

That it will likely be a great resource in the modern world as the oil finally runs out or the Middle East becomes unreachable due to war is no surprise. There's always been a use for it.

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