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Cobalt and Copper Oxide can also cause health problems. Use caution with
At 07:36 AM 3/19/97 EDT, wrapf wrote:
>Egyptian Paste from Daniel Rhodes "Clay and Glazes for the Potter":
>Ball clay 5
>Sodium Bicarbonate 6
>Soda Ash 6
>Fine Wnite Sand 8
>Fire to cone 08
>Add Bentonite to increase plasticity
>About 3% Cobalt Oxide will give a strong blue
>Copper Oxide 3-6% will produce turquiose.