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What is a Crystal glaze: Glossy green and brown ?

Recipe: Glossy green and brown

Crystal glazes: Glossy green and brown
A good crystal glaze based on zinc and lithium. Spray the glaze thinner near the bottom of the pot, or it will run a lot. 1260oC with 1/2-3/4 hour at the top temperature. Does not need a slow cooling. Brown, sometimes two-colored crystals.
potash feldspar NR 28,50
quarts (flint) 33,30
dolomite 3,52
zinc oxide 19,50
barium carbonate 4,61
china clay 3,00
lithium carbonate 7,59
rutile 1,36
red ferric oxide 1,63
manganese carbonate 1,36
copper oxide 0,81

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