BISQUE IS FIRED TO CONE O4 & READY TO PAINT
Low Fire: In low fire, the bisque temperature is usually hotter than the firing temperature. For example, most commercial glazes recommend bisque firing to Cone 04, and glaze firing to Cone 06 (which is cooler). The reason for this is to make sure all the carbon and other materials in the clay burn out during the bisque firing. If you glaze fired to a hotter temperature than the bisque, it is possible that more carbon would burn out during glaze firing, causing blisters in the glaze which would not have time to heal over.
The first principle is that you want to bisque low so that the ware is still very porous and can absorb glazes.
The second principle is that you want to bisque hot enough that your piece doesn't absorb too much glaze resulting in it being too thick or actually causing the piece to fall apart. In fact, this is the main reason to bisque at all.
The second principle is that you want to bisque hot enough that your piece doesn't absorb too much glaze resulting in it being too thick or actually causing the piece to fall apart. In fact, this is the main reason to bisque at all.
