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Thanks again for your comments, I'll see another shape or something else.

Keep you informed in case of success 

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Hi Callie, distributed by a french supplier CERADEL. The clay is GT5700B (to be fired between 1250°C and 1280°C). The glaze is "vert pré" EG225 (to be fired between 1180°C and 1250°C).

I fired à 1220°C.

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Right, it was stoneware.

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Yes I've built my ribbons. Someone told me to use clay grog (or with grog) and may be it should work. I'll try with different size of grog.

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Thanks for your advices, I'll try something like a kind of fusible pillar in the center

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Hi, I've a problem. I made a piece with clay stoneware. When it dries = OK. When biscfire = OK. But when firing after glazing à 1220°C, the piece collapse, see pictures. Maybe the temperature is too high. But it's a long time I'm working this clay without problem. Whether I use earthware the piece doesn't collapse. But I want to use my glaze and I don't want to by glaze for earthware. What could I do ?

Thanks for advice

Sean

Collapsing.pdf