Michele Jurist on sun 20 dec 98
Hi:
The ratio I use for low-fire glazes is twice as much copper carb as copper
oxide. It works for me. I don't know if it is the same for high fire.
Michele in Seattle
David Hewitt on mon 21 dec 98
Theoretically the position is as follows:-
The Mol. Weight of Copper Oxide (CuO) is 79.5 and that of Copper
Carbonate (CuCO3) is 123.5.
The conversion factor for Copper Oxide is 1 ( 1 gram will add 1 gram to
the fusion) while that of Copper Carbonate is 0.644, (79.5/123.5)
because there is the loss of CO2 during firing. This means that you
would need approx. 1.5 times (1/.644) Copper Carbonate to match the
Copper Oxide.
David
In message , Michele Jurist writes
>----------------------------Original message----------------------------
>Hi:
>
>The ratio I use for low-fire glazes is twice as much copper carb as copper
>oxide. It works for me. I don't know if it is the same for high fire.
>
>Michele in Seattle
>
--
David Hewitt
David Hewitt Pottery ,
7 Fairfield Road, Caerleon, Newport,
South Wales, NP6 1DQ, UK. Tel:- +44 (0) 1633 420647
FAX:- +44 (0) 870 1617274
Own Web site http://www.dhpot.demon.co.uk
IMC Web site http://digitalfire.com/education/people/hewitt.htm
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