Suspender: A material added to a glaze slop in order to facilitate the suspension of heavy particles in water. Suspenders usually act by the creation of a
macrostructure which hold particles in dispersal.
Glost: Originally a second firing of ware
to a lower temperature than the
preliminary firing, but now used (most
certainly amoung studio potters) to refer
to any firing of glazed ware.
To glaze our pots, we will usually be dipping them in liquid glaze. If we dip greenware in liquid, we run a good chance of it absorbing too much water and falling apart. This is why we bisque fire the work before glazing. The main purpose of the bisque firing is to harden the work in order to glaze it. Bisqued clay (or bisqueware) is porous, so it will absorb water to ensure a sufficient glaze coating. Bisque firing also burns off organic compounds in the clay (molds, bacteria, lignite, carbonates, and sulfates) that can cause problems if they burn off through the glaze. For stoneware firing the bisque is usually fired to about cone 06 (18400F).