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This has happened on multiple occasions; the handle survives holding separate pieces of the remaining mug. The porcelain seems to have an elasticity that enables it to withstand impacts. And it breaks to razor-sharp edges. While this is technically not a mullite porcelain, most people handling and using the ware would not notice.

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To a potter, it may seem impossible that a body can be this porcelain-like at such a low temperature. And that such a body can be as plastic as this is. Achieving these came at the cost of shrinkage, both drying and firing, 18% total (vs 14% of a Grolleg cone 10 porcelain). Using this Zero4 fritware, very thin-walled pieces can be thrown. The frit also produces a body having a higher thermal expansion, so it fits any low-temperature glaze we have tried. This glaze is G1916QL3 ultra gloss clear glaze on Amaco Velvet underglazes. The low temperature has another benefit: Very sharp edges on painted underglaze designs. Zero4 replaces my old Zero3 fritware with a body that works at a more common temperature. It also employs a tiny amount of blue stain to produce the bluish-white color. Like Zero3, you can also make this yourself.
| Glossary |
Zero4
The designation for a group recipes for body, glaze and engobe (by Tony Hansen), that potters can use to make low fire stoneware and fritware porcelain |
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