What is the secret of the higher gloss glaze on the right? Yikes, it is lead!


Tuesday 23rd June 2015

These cone 04 glazes have the same recipe (a version of Worthington Clear sourcing B2O3 from Ulexite instead of Gerstley borate). While the one on the left is OK, the one on the right is great! Why? It has 10% added lead bisilicate frit. Of course, I would not recommend this, I am just demonstrating how well it melts. Still, we gasp at the thought of using lead while we thrive on unstable flux-deprived, glass-deprived and alumina-deprived base stoneware glazes with additions of toxic colorants like chrome and manganese!

Pages that reference this post in the Digitalfire Reference Database:

Lead Bisilicate Frit, Ulexite, Insight-Live.com share for Worthington Clear with Lead, Transparent Glazes


This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.