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This is a fairly minor POD but which for some reason started to interest me. IOTL modern European porcelain was developed presumably by Ehrenfried Walther von Tschirnhaus in 1708 in Saxony. (There had been some earlier production but quality and quantity hadn't been yet so great.) So what if some merchant interested in chemistry (say in France) was able to create good quality porcelain two hundred years earlier in 1508?