Cordierite Mullite Square Kiln Shelf StoolsApronsOther The crystals in the glaze

The crystals in the glaze will melt when fired

Crazing will likely result as the clay body won't move much and the glaze will

Durable stainless steel tile cutters

Black copper oxide is a black powder used as a colorant in the preparation of slips and glazes

and have a smooth carved texture

Cordierite Mullite Square Kiln Shelf StoolsApronsOther The crystals in the glazeThis kiln shelf is manufactured of a high refractory mullite cordierite clay body that yields a smooth, durable surface for stacking ware in your kiln. All shelves are subject to warpage at high temperatures. It is a good practice to occasionally flip the shelf in an effort to keep it straight.