This glaze is based on the Anderson Ranch Khaki in John Britt's Glaze Book
I fire to cone 11 bending in a neutral atmosphere(oxyprobe under .12) in my propane gas kiln. I fire in about 13 hours, soaking for 40 minutes when I reach temperature.
I'm trying to figure out why this glaze looks different in these 2 tests. My guess is that the left hand one fired hotter and also was soaked longer so that crystals formed. This mottling happens(I think) more in the area nearer to the flame path of the burners, hence my guess about the hotter temp.. But these 2 variations of the glaze can show up in the same firing next to each other! It could be that it's purely a temperature issue, with the crystals forming as the glaze gets fired hotter. OR it could be that the glaze gets mottled when appled thicker...What do you think?
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2 vases with firebrick glaze
