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Post by evan cornish-keefe on Jun 8, 2018 21:22:40 GMT -6
Yeah, the UMF is extremely useful for these glazes. I don't really see reason for that little bit of molochite tho. My observations from testing a crystalline base with different Silica and Alumina levels plotted on a Stull Chart was that for the glaze to crystallize well, silica should be between (very roughly) 1.8 and 2.4 With up to .2 Alumina the crystal growth was still very fast. Here's a cone 5 glaze, the frit used is 3124, with roughly 20% EPK (about .25 alumina and about 2.4 silica) - www.willemiteceramics.com/shop-pottery/jazzycrystalmugCrystal growth is slower, and the hold temperatures seem to need to be a bit higher than the lower alumina versions, but it doesn't run enough to require catchers or grinding, so that's ok with me.
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