RainePotter Posted November 29, 2023 Report Share Posted November 29, 2023 I am working with a glaze that has gerstley borate, cause I have plenty. I have only found 2 cone 1 glaze recipes on line. The recipe I’m working on is clear not quite smooth enough and has tiny bubbles. I want to opacify it for white. I tested tin, zirco, and others. But I’m not getting a good melt. I have some Frits on hand. Guessing I should fix the glaze without opacifiers first? shall I up the gerstly? Or try frit 3134 or 3124? Quote Link to comment Share on other sites More sharing options...
Min Posted November 29, 2023 Report Share Posted November 29, 2023 Hi and welcome to the forum! Are you looking for a glaze for functional work? If so is your clay mature at cone 1? Post the recipe you are trying to alter. Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 30, 2023 Report Share Posted November 30, 2023 (edited) 7 hours ago, RainePotter said: am working with a glaze that has gerstley borate, cause I have plenty. I have only found 2 cone 1 glaze Just asking - have you tried lowering the melting point by apportioning the boron? It’s pretty typical to get to cone 6 with .15 boron. The relationship has tested fairly predictable to cone 04. The chart below would indicate prox 0.3 boron gets you cone 1. Katz ceramic arts article here https://ceramicartsnetwork.org/docs/default-source/uploadedfiles/wp-content/uploads/2008/10/tf-boroninglazes-0912.pdf as far as satin and matte - Stull matte allows you to dial in level of matte / gloss. Testing for sure ….. still may give you a starting point. Other thought is take some favorite cone six recipes and increase the boron to 0.3 or so and lower the melting point. Edited November 30, 2023 by Bill Kielb PeterH 1 Quote Link to comment Share on other sites More sharing options...
Denice Posted November 30, 2023 Report Share Posted November 30, 2023 I have used a Majolica Satin Matt C1 for tiles but have never used it for functional work. If you need the formula, I will dig it up for you. Denice Quote Link to comment Share on other sites More sharing options...
RainePotter Posted November 30, 2023 Author Report Share Posted November 30, 2023 The cone one clear recipe I’m using is: GB 28.00 neph. Syenite 46.00 epk. 6.00 silica. 20.00 bentonite. 1.00 i’d love to learn to calculate boron using that chart but don’t quite know enough yet ☺️ Hulk 1 Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 30, 2023 Report Share Posted November 30, 2023 1 hour ago, RainePotter said: i’d love to learn to calculate boron using that chart but don’t quite know enough yet ☺️ You can use the Glazy calculator for free, it also shows Stull, not a bad place to learn actually many tutorials and online help. Quote Link to comment Share on other sites More sharing options...
Hulk Posted November 30, 2023 Report Share Posted November 30, 2023 Tony Hansen has published a few articles on low fire glazes, e.g. G1916Q (digitalfire.com) Quote Link to comment Share on other sites More sharing options...
Min Posted November 30, 2023 Report Share Posted November 30, 2023 I've got an altered cone 1-3 glaze from Charlie Cummings who came up with it from Linda Arbuckles glazes. Given the variability of materials and firing conditions if you try it please just try a small test amount first. Cone 1-3 Majolica White Gerstley Borate 10.30 Nepheline Syenite 8 EPK 5.6 OM4 Ball clay 4.5 Whiting 9.75 Silic 24 Ferro Frit 3124 37.5 Zircopax 12 The alumina in your glaze is really quite high for a lowfire glaze, it's probably why you aren't getting a good melt. (alumina stiffens a glaze) Piedmont Pottery and Rae Reich 2 Quote Link to comment Share on other sites More sharing options...
RainePotter Posted December 1, 2023 Author Report Share Posted December 1, 2023 Thank you! I’ll try glazy and this new recipe. I think I’ve got the stuff on hand! Quote Link to comment Share on other sites More sharing options...
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