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Does speedball or other underglazes stick to a kiln shelf? I noticed for the house ornament Jessica used the speedball black underglaze to sign the back. Can you put this on the kiln shelf directly?
Also, a clear celadon was applied over the speedball underglaze. Should this then be fired at a cone 5-6? Is this the firing temp for underglazes?
I use under glazes all the time on both bisque and green ware. Neither application will stick to the kiln shelf but may leave some color transfer. Once any kind of glaze is applied the glaze will stick to the kiln shelf. OK to underglaze or use interative pigments on the bottom but no glaze without a stilt.
Your firing temp always depends on the clay body and recommended glaze cone requirements.