Copper does not necessarily cause glazes to leach if used in moderate amounts

Friday 31st July 2015

These are four cone 6 glazes of diverse chemistry. They have varying melt fluidities. They are soaked (halfway up) in lemon juice overnight. None show any evidence of surface changes. All contain 2% insight-live.com/material/236">copper carbonate. If the copper was increased, especially to the point of going metallic or crystallizing, the leaching test would produce different results (especially on the ones that are running, they lack SiO2 and Al2O3). So, if you use copper sensibly (in moderate amounts), there is a good chance of making a glaze that resists leaching.

Pages that reference this post in the Digitalfire Reference Library:

CuO, Copper Oxide and Carbonate, Leaching, Food Safe

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