Robert Klander on tue 29 oct 02
Hello all,
My friend has been looking for a formula for "Alfred Blue" suitable for cone
10 reduction firing. Can anyone help?
Many thanks,
Robert
June Perry on tue 29 oct 02
I checked my glaze database and this is the only Alfred blue glaze that came
up. It's lists several color variations.
I rant this through IMC softare version 5 and it's within C10 limits, but a
little low on silica and alumina for C10 copper limits. If you up the EPK to
20.7 and the silica to 33.2 it brings it up to C10copper limits, keeping the
Silica:Alumina ratio pretty close (Original is 7.61, Revised for C10 copper
limits is 7.58), and giving a better rate of expansion by lowering the
expansion to 7.17 (orginal has expansion of 7.36)
#761 ALFRED BARIUM C 10 REDUCTION
BARIUM CARBONATE 9.3
WHITING 17.8
G-200 POTASH FELDSPAR 12.4
NEPHELINE SYENITE 12.4
EDGAR PLASTIC KAOLIN 18.2
FLINT 29.9
BLUE - COBALT CARBONATE 1%`
BLUE (GREENISH)COPPERC2%,COBC1/2
GREEN - COPPER CARB 2%
GREEN (PICKLE)COPPER CARB3,RUTILE 3
BROWN - MANGANESE DIOXIDE
YELLOW - VANADIUM STAIN 10%
WHITE - ZIRCOPAX 7%
Robert Klander on wed 30 oct 02
Hello June,
Thanks so much for the information on the Alfred Blue. My friend has
been looking for months for this, and now she has it, with all of the
suggestions for adjustment. She's going to mix up a batch today, and
see what happens.
Quite a happy person today!
Best,
Robert
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