Zinc is a very early metal first smelted and used in India/Asia where it is often used as a decorative white metal. I have read that the first smelting of zinc in the Uk was in Bristol around 16th cent. As to its historic use in Africa, I would imagine in Egypt and the North this was early to. Zinc is used on many Sudanese and Somali weapons often confused with aluminium which is ofcourse also used since around 1920. I know zinc was certainly in use in Central Africa In the 19th cent and see now reason even if there was no local smelting , that traded zinc would not have been used earlier. Tim
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