Wade Blocker on mon 24 may 99
Silicon carbide is added to a glaze fired in an electric kiln to create an
artificial reduction glaze. It is necessary to use a very fine mesh of
silicoon carbide. FFF grade is 325 mesh, though it is available as fine as
600 mesh. This can be purchased either from a ceramic supplier or a
chemical supply store. I have obtained fairly nice reduction reds on
porcelain clay using the following recipe:feldspar 42%, Kaolin l.8%flint
26.5%,whiting 2.6%,gerstley borate 8.8%dolomite 8.8%zinc oxide l.7%,barium
carbonate 4.4% addCu oxide black 0.5%,Cu Carb 0.25%,Silicon carbide 0.4%,
fired to cone 9 in oxidation.For artificial celadon add 0.5 silicon
carbide and l.5 red iron oxide to the above recipe and leave out the copper
of course. If you fire at a lower temperature you have to test the above
ingredients in a gloss transparent glaze that matures at your firing
level. Hope this helps.
Mia in Albuquerque
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