Stuart Altmann on wed 21 jan 98
Several people have asked me for the recipe for the blue glaze that breaks
rust-brown where thin. The recipe follows. Note, however, for this glaze
to be at its best, you need very old light rutile. (My stock--now exhaused,
alas--was acquired more than 24 years ago from a potter who quit potting.)
Better yest, if you have an old stock of light rutile that you can spare,
please contact me. Perhaps we can swap for something you need but can't
get, such as ashes of specific eastern hardwoods (e.g. red oak, hickory)
Rob McClurg's blue/brown (^9, oxidation or reduction)
Custer spar 422
whiting 117
barium carb 117
kaolin (EPK) 67
flint (silica) 252
bentonite 25
subtotal 1000
rutile, light tone 50
red iron oxide 50
copper carbonate 5
Use on a tan/beige stoneware, not on porcelain or other white clays, on
which it will be an unattractive brown-maroon
Stuart Altmann
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