First published in 2002 this book wrtiten by potters Ron Roy and John Hesselberth is an essential guide for making stable, durable, attractive glazes. It includes numerous sample glaze recipes and photos. Ron Roy is a former owner-operator of Rodaco Clay in Toronto and is a well-known glaze calculation teacher. John Hesselberth is a retired chemical engineer and creator of GlazeMaster glaze calculation software.