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Substituting feldspar


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I have a glaze recipe I haven't used in about 40 years. It contains 52% feldspar and the firing temperature given is 1250. My current kiln only fires to 1000 so can I substitute borax for the feldspar to lower the ffiring temperature? Thanks for any help you can give me.



No, The substitution is more complicated than that. I would have to say that you need to look for a new batch of formulas. Your old formula is basically ^6 and you kiln is fining under ^04.

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