cobalt used in ceramics originates from a middle eastern process developed in
mesopotamia, during the babalonian empire. outer walls of babalon are bricks
of glazed cobalt.
this process was imported to china, and even the cobalt ore material from kashan
in perisia...from about 1320 at Jingdezhen, china, to present day, chinese cobalt
underglaze has been established
the chinese used a cobalt to iron ratio first, and then cobalt to manganese
eventually the chinese found their own cobalt ores, which contained variations of
silica or alumina...alumina causing cold blues and silica causing (hot) red blues
our present day access to pure refined materials as glaze ingredients and the seger
forumula, cannot duplicate chinese glazes with its site specific materials and
exploring and developing local unrefined materials is worthy of putting into
noel oard mapstead
> Why I am at it, does any one know where cobalt comes from?
> Neville Longbottom
> enjoying the crisp, cool weather hear at Hogwarts England.
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