Pecunia non olet or Money doesn’t stink! is a Latin saying. During the 1st century AD, Roman emperor Vaspasian placed a tax on urine. The buyer(s) of the urine paid the tax. The urine from public urinals was sold as an essential ingredient for several chemical processes e.g. it was used in tanning (not exactly sure how), and also by launderers as a source of ammonia to clean and whiten woolen togas etc. Therefore, those who obtained valuable urine from collectors were charged a tax.