Why is this transparent so full of bubbles?

Wednesday 2nd April 2014

An example of how a micro-bubble population in the matrix of a transparent glaze can partially opacify it. If this glaze was completely transparent, the red clay body would show much better. However this is not the fault of the glaze. On a white body it would be more transparent. The problem is the terra cotta body. This is fired at cone 02. As the body approaches vitrification the decomposition of particles within it generate gases that bubble up in to the glaze. A positive aspect of this phenomena that this glaze could be opacified using a lower percentage of zircon.

This type of glaze responds better to opacifier additions.

Pages that reference this post in the Digitalfire Reference Library:

Opacifier, Opacification, Glaze Bubbles, 1950F-Body decomposition causes glaze bubbles

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.