Copper can destabilize a glaze and make it soluble

Saturday 6th April 2013

A closeup of a glossy Cone 6 glaze having 4% added copper carbonate. The bottom section has leached in lemon juice after 24 hours. This photo has been adjusted to spread the color gamut to highlight the difference. The leached section is now matte.

Pages that reference this post in the Digitalfire Reference Database:

CuO, Are Your Glazes Food Safe or are They Leachable?, Having Your Glaze Tested for Toxic Metal Release, Food Safe, Leaching

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