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: re: copper, cobalt, and rutile (long)

updated tue 22 apr 03


iandol on sun 20 apr 03

Dear Ellie Blair,

Regarding the distinction in use between Copper Oxide and Copper =

Because the Carbonates have to undergo decomposition to create glaze =
soluble oxides the process has the effect of refining the grain size, =
giving much smaller particles than can be obtained by grinding.

I think the assumption is that copper oxide derived from Cu-carbonate =
will dissolve more rapidly and disperse more thoroughly in the melt =
giving a better colour response.

Best regards,

Ivor Lewis