Just curious how people are doing on coming up with glazes without GertsleyBorate. Does anyone have a favorite out of the "Mastering Cone 6 Glazes"book? All of the glazes we use in the studio I have worked in are based onthe various Gertsley formulas. The glazes I like are the Randy's Red,Honey, and the copper glazes that can't be used on the inside of pots(Pennels with Erins green)...I have just bought an electric kiln and have "Mastering Cone 6 Glazes" . Iwas schooled in reduction ^8-10 and am more than a tad nervous about thewhole endeavor of oxidation firings at cone 6. To me even the GertsleyBorate glazes often look flat with oxidation ^6. My favorite glazes that Ilearned on were Albany slip with rutile oxide decorations, the iron basedceladon when it went blue sea green, and Shino. I do not want to carry onthe error of using GB. I'm working in a very small space and don't reallywant to buy more that a half dozen bags of ingredients. In any case I can'tseem to kick start myself into beginning. I find that even though I used tomake up our glazes for reduction firings that I don't know what silica touse for the base glazes out of MC6G... We never used silica as theingredient "Silica" and my catalogs don't have anything listed in that formthat appears to be a glaze ingredient. Now I have given much moreinformation that anyone cares to read or is interested in..... Mostly I'mlooking for some kind of nudge to get me in gear.

Hi dkat,I have started playing with cone six glazes by adjusting my favourite cone10 glazes... however, I was always firing oxidation, so it was a bit easier.Anyway, If you add 10% frit 4108 ( used to substitute gerstley borate) tocone 10 glazes, you are likely to get simmilar glaze maturing at cone6....as a rule of thumb... or replace potash feldspar with soda feldspar.I tend to avoid gerstley as it is water soluable and tends to spitt off potsduring firing.Andrea

And how does one get the new firing schedule?

Cone 6 Glazes WITHOUT Gertsley Borate?

Jul 16, 2004 23 Replies

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dkat 22 years ago

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Bert Gibson 22 years ago

Here is the direct link, but you might like to go through the whole slide presentation. It is very interesting.

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Bert Gibson

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dkat 22 years ago

Yes, that was well worth the visit. Thank you for pointing it out. I had assumed I knew that site and did not page down to see the new additions.

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