Comparing the melt fluidity of four copper blue cone 6 glazes

Saturday 25th July 2015

The first glaze is a control, a standard non-fluid clear with copper. The other three are the short-listed ones in my project to find a good copper blue recipe starting recipe and fix its problems (which they all have).
The GLFL testers for melt flow at the back and the GBMF test melt-down-balls in front contain 1% copper carbonate. The glazed samples in the front row have 2% copper carbonate. L3806B, an improvement on the Panama Blue recipe, has the best color and the best compromise of flow and bubble clearing ability.

Pages that reference this post in the Digitalfire Reference Database:

Copper Carbonate Basic, G3806C - Cone 6 Clear Fluid-Melt Clear Base Glaze, GBMF Glaze Melt Fluidity - Ball Test, Two bases, 2% copper additions. Which is the better transparent?, 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