iandol on wed 26 dec 01
Dear Carol,
How the gremlins conspire to thwart us!!.
Could you by any chance have had some unexpected reduction in your kiln =
during that firing? If so, you may be suffering from Complementary Hue =
Degredation!! which is an optical effect. NOthing to do with your =
Cornish Stone. Recall discussions earlier in the year regarding Cobalt =
greens and how these could occur when Cobalt Ox. or Carb. were used in =
conjunction with Rutile? Under conditions of reduction the Copper =
changes to red which reacts optically with the cobalt green to give =
Bright Gunge. Any residual cobalt blue will enhance the Olive tone.
A Happy New year to you.
Best regards,
Ivor.
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