From https://community.ceramicartsdaily.org/topic/1557-gold-lustre-and-alkaline-glaze/?do=findComment&comment=10521 1. Lustre is a thin film of metal deposited on the surface of a fired glaze. It is NOT a glaze in itself. It relies on the glaze interaction with the lustre for adherence and this can be anywhere between 720.C-820.C depending on the hardness of the glaze. Earthenware glazes are usually refired between 720-750.C while stoneware and porcelain usually refire between 780-