Marco Polo in the Pioneering Region of Zinc Manufacture

Marco Polo in the Pioneering Region of Zinc Manufacture 

Marco Polo made extensive journeys in the East during 1271-1295. In Persia he came into contact with zinc and zinc manufacture. He describes it very concretely, as described in ref [33.2]  

It is quite clear that the zinc oxide subHmates at the high temperature of the furnace and is deposited on the iron grating above the furnace. Tutia is zinc oxide, while Spodium is a mixture of other oxides with low sublimation pressures. 

---