I am very confused, and FASCINATED. You refired a Cone 10, in RAKU, and not only did it not explode, but the glaze actually bonded??? Never heard of anything even close to this, do a lot more of it and tag me in all the posts! 🤣
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Kind of makes sense, raku is ~1800 degrees, cone 10 ~2380, so the piece transitioned through the lower temperature twice already (on the way up and the way down from cone 10).
Fixing a drainage problem on our building means no high fire and no raku for ~3 months.
Arrrrgggghhhh!
The speed of the temperature change is usually what makes it so prone to explosion, it's the same reason you don't take a glass casserole dish from the refrigerator and put it directly into a hot oven. The type of clay that does well at 10 isn't usually as "flexible" with heating and cooling.
The glaze adhering to an already vitrified clay, and with a glaze at a higher melt point is also interesting, I would guess a similar mechanic to luster where the high fire glaze gets *just* hot enough to be tacky and raku has such a high metallic content it bonds. It's a fascinating process.
I have been using a high-grog phoenix clay, which is supposed to be very thermal shock resistant, for both my cone 10 and raku work. I like that I can change my mind after the bisque.
Very interesting! I may have to look into that when I'm up and running again. My usual work is 5/6, but I'm going to be doing tutorials of a lot of things and one clay body that could do raku or high fire would be super convenient!
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Fixing a drainage problem on our building means no high fire and no raku for ~3 months.
Arrrrgggghhhh!