These tanneries use the same recipe of Pidgeon Droppings, Urine, amongst other pleasant ingredients to help clean the leather before colouring.
The Al-Attarine Madrasa is a madrasa in Fes, Morocco, near the Al-Qarawiyyin. It was built by the Marinid sultan Uthman II Abu Said in 1323-5. The madrasa takes its name from the Souk al-Attarine, the spice and perfume market.