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Urine has been used since ancient times for bleaching cloth and even for brushing teeth. Roman emperor [[Vespasian]] levied a tax on stale urine, obtained from street latrines and urns placed for the purpose of collection, and stored for several days, which allowed bacteria to development abundant [[ammonia]] content, commonly used for bleaching cloth.<ref>See the following articles:<br>[http://www.wisegeek.com/is-it-true-that-people-can-use-urine-for-bleaching.htm Is It True That People can Use Urine for Bleaching? (wisegeek.com)]<br>[http://www.ancient-origins.net/history-ancient-traditions/money-does-not-stink-urine-tax-ancient-rome-003408 Money Does Not Stink: The Urine Tax of Ancient Rome (ancient-origins.net)]</ref>

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