davidh4976 Posted December 13, 2023 Report Share Posted December 13, 2023 I've been working on reformulating our communal pottery glazes so they don't use Gerstley Borate. I've been making decent progress but am getting stumped on reformulating our Falls Creek Shino. The iterations I've tried do not get the nice breaking between cream and brown that we get with our original formula. It probably doesn't help that I'm also trying to eliminate Alberta Slip from the recipe. Anyone have a good cone 6 "shino" without Gerstley Borate or Alberta Slip that they would care to share? Our current Falls Creek Shino: alberta slip 56.1 gerstley borate 18.7 silica 9.4 minspar 200 9.4 lithium carbonate 6.5 zircopax 9.4 tin oxide 4.7 Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted December 13, 2023 Report Share Posted December 13, 2023 Just curious - Are you trying to sub the boron through Fritt or are you just eliminating the boron Quote Link to comment Share on other sites More sharing options...
davidh4976 Posted December 13, 2023 Author Report Share Posted December 13, 2023 3 minutes ago, Bill Kielb said: Just curious - Are you trying to sub the boron through Fritt or are you just eliminating the boron sub Quote Link to comment Share on other sites More sharing options...
Min Posted December 14, 2023 Report Share Posted December 14, 2023 Falls Creek "Shino" and others that mimic that look are usually dangerously high in lithia. Ideally the maximum amout of lithia at the very top end shouldn't exceed 0.20 molar. Whichever iterations of that glaze you land up using I would really suggest lowering the lithia content if it's above that, whether it's supplied by spodumene, petalite or lithium carbonate. In your posted reciped dropping the lithium carb from 6.5 down to 4.5 and then really testing for shivering (expecially on low expansion bodies) would be a good idea. Before Alberta Slip became popular these type of glazes usually employed Redart (or a similar earthenware clay) to supply the iron, don't know if you have tried a sub with that? (and rebalanced) What are the recipes you have tried that haven't worked out? Need a hand with reformulating the recipe you have? davidh4976 and Rae Reich 2 Quote Link to comment Share on other sites More sharing options...
davidh4976 Posted December 15, 2023 Author Report Share Posted December 15, 2023 Min, I have a couple of more things I'm going to try. If they don't work, yes, I could use a hand! Quote Link to comment Share on other sites More sharing options...
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