September 10, 2010, Newsletter Issue #412: Recipe:Glossy cobalt blue
Tip of the Week
Crystal glazes: Glossy cobalt blue
One of my most popular crystal glazes based on zinc and lithium. Too thick it will run a lot, and it is not so easy to find the best thickness. Always spray the glaze thinner near the bottom of the pot. 1260oC with 1/2 to one hour at the top temperature. Does not need a slow cooling, but will sometimes be better if you make a second equal firing. A delicate but difficult glaze.
potash feldspar NR 28,40
quarts (flint) 33,00
dolomite 3,66
zinc oxide 19,26
barium carbonate 4,58
china clay 2,75
lithium carbonate 7,34
rutile 0,92
cobalt oxide 1,38
red ferric oxide 2,02
manganese carbonate 0,37.
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