Switching copper carbonate for copper oxide in a fluid glaze

Wednesday 24th June 2015

The top samples are 10 gram GBMF test balls melted down onto insight-live.com/glossary/71">porcelain tiles at cone 6 (this is a high melt fluidity glaze). These balls demonstrate melt mobility and susceptibility to bubbling but also color (notice how washed out the color is for thin layers on the bottom two tiles). Both have the same chemistry but recipe 2 has been altered to improve slurry properties.

Left: Original recipe with high feldspar, low clay (poor suspending) using 1.75% copper carbonate.
Right: New recipe with low feldspar, higher clay (good suspending) using 1% copper oxide.

The copper oxide recipe is not bubbling any less even though copper oxide does not gas. The bubbles must be coming from the kaolin.

Pages that reference this post in the Digitalfire Reference Library:

Copper Carbonate, Copper Oxide Black, Copper Carbonate Basic, Melt Fluidity

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.