Originally Posted by stach
I was watching a documentary about Pompeii and they used to use urine to wash clothing. Laundrys would leave piss pots outside their doors and the guys would relieve themselves there. Who knew?
Question: when does urine, as mentioned above, go "stale"?
As to the text quoted above, yes, urine was used in dying and cleaning in ancient Rome. The Emperor Vespasian actually passed a tax on urine (don't ask me how it was enforced, it's what the prof said), which was why up until the mid-20th century, the outdoor latrines on many French blocks were known as vespasiennes