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Before whitening strips, ancient Romans used urine to brighten their pearly whites. Urine was a rich source of urea, a nitrogen-based compound that when set aside for long periods decays into ammonia.


Ammonia acts as a weak base when in water, making it the perfect substance for the ancients to use when softening and tanning animal hides to make leather.
Soaking the animal skins in urine also made the process of removing hair and bits of unwanted flesh from the skin.


In ancient Rome, vessels were placed on streets as urine collectors. After the buckets were full from people passing by to relieve themselves, the vats were taken to a laundry and used to wash dirty clothes.


Apparently stale urine was popular with 16th century Brits. During the 1500's, families dedicated chamber pots to collecting their pee to be used in developing brighter colors when dying fabric.


Charcoal and sulfur used in small quantities to make gunpowder are easily found. But the main ingredient, potassium nitrate was only made available on a large-scale in the early 1900's. Until then, gunpowder manufacturers used the nitrogen found in urine to make their product


But in the ecosystem, lizard urine would add to the needed nitrogen that plants used.

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