The running glaze collects in a catcher sized to match the base of the piece. A calcined alumina or kiln wash paste (made using CMC gum or other binder) is applied to the base of the piece so that it does not stick to the catcher. After firing the catcher is broken off and the remaining sharp edges around the base of the piece are ground off.
A type of ceramic glaze made by potters. Giant multicolored crystals grown on a super gloss low alumina glaze by controlling multiple holds and soaks during cooling