Rayn Leow Ceramication Founder Singapore Pottery Porcelain-9995 01/02/2022 4063 × 3691 Rayn Leow Ceramication Founder Singapore Pottery Porcelain-9995 At the pre-fired stage, raw glaze is just powdered material suspended in water. This suspension is applied on to the bisqueware by means of dipping or hand-painting. Water seeps through the pores, leaving only the powdered material on the surface.