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Worthington Clear with Ulexite:PbO
Total:109.80 Auto Unity Formula
Notes *The adds lead to the Ulexite version of Worthington clear (G2931B). This is more crystal clear, it fires very well on various terra cotta clays. The slurry is also outstanding, it gels well (in contrast to the gelled mess of the Gerstley Borate version), applies well and does not settle at all (a whole new experience for long time Worthington Clear sufferers!). Pictures 16x image of entrained bubbles These are in the PbO enhanced Ulexite version of Worthington low temperature clear. Left B, right E The little extra lead frit gives it quite a bit better gloss. GB vs Ulexite Clear glaze bubbles These are 10 gram balls fired down onto tiles at cone 04 to compare melt fluidity and bubble populations in three clear glazes. Larger bubbles are better, they break at the glaze surface and heal. Tiny ones produce cloudiness. Ulexite PbO clear at cone 04 These are various different terra cotta clays (also a low fire white-buff fritted stoneware). All are fired with a drop-100F-and-soak firing. Fits is good on all except a fritted terra cotta stoneware where it is shivering slightly. All survived a boil:ice test. Terratone test with G2931E glaze A little shivering after boil:ice test. XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Worthington Clear with Ulexite:PbO" id="75220" key="hibaB3oX" date="2015-06-29" codenum="G2931E" picturebasename=""> <recipelines> <recipeline material="EPK" amount="25.100" tolerance=""/> <recipeline material="Silica" amount="10.600" tolerance=""/> <recipeline material="Ulexite" amount="26.500" tolerance=""/> <recipeline material="Ferro Frit 3249" amount="16.900" tolerance=""/> <recipeline material="Wollastonite" amount="15.500" tolerance=""/> <recipeline material="Nepheline Syenite" amount="5.200" tolerance=""/> <recipeline material="Frit B300" amount="10.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2014-03-19, Modified: 2015-06-29 12:30:48 |
Firing Schedule Name Cone 04 Glaze (drop-100-soak) Degrees (Fahrenheit or Celcius) F Schedule Type Rate Start Time and Temperature 7:00 am (no temperature specified) Program
Notes Rather than holding for a longer time at the top temperature, this schedule follows the custom of cooling 100 degrees and holding there for half an hour. The idea of this is that reactions that generate gases that cause pinholes and blisters will have stopped. Pictures |