Glazes - Randy's/Toby's Red

Any glaze I've tried (Or have seen tried) that substitutes frit for GB just doesn't meet muster.

I'm not familiar with the #'s next to the glaze components. Could you kindly provide either an explanation of the quantities, or the 100%+ formulas I'm used to? Thank you so much. I'm anxious to try a ^6 red.

What about Gillespie Borate? It's supposed to be a direct substitute for Gerstley. I can't do a direct comparison myself since I don't have any Gerstley. I have not had much luck with red recipes in general, and I think it may be due to my tiny kiln cooling too fast. But I will give this a try and report back.

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

Those are grams (total of 10,000 in the original recipe with Iron Oxide being 15%). Various people have tweaked it but it is always near what you see. If you want it converted to lbs let me know and tell me what amount you want. This fills a 5 gallon bucket more or less.

FYI

I think slow cooling is critical to this recipe being consistently red (put it in the center of the kiln?). Oddly it also improves with 'aging'. Perhaps FeO going to FeO2? I like this recipe a lot but it can be a real ugly brown if too thin or if the crystals don't develop. If you do something like a bowl, you will notice that the inside is nicer than the outside (I'm guess both thickness and cooling play a part here). It takes the 'Special' red iron oxide not the Spanish. Spanish give a brown glaze. The red is a very earthy red - not Target red. I thought digital fire compared the typical oxidation iron red done with both Gerstley and Gillespie but I now can't find it and the site looks different.

Not to steal DKat thunder, but this may help. But in response to Bobs request .

Gerstley Borate 3200