Glaze is shivering at the engobe-body interface

Tuesday 29th July 2014

Example of a glaze (G1916J) insight-live.com/glossary/79">shivering on the rim of a mug. But the situation is not as it might appear. This glaze fits some bodies, crazes on others and shivers on yet others! This is a testament to how tricky it can be to fit glaze at low temperatures. But this is not a white glaze, it is a transparent over a white slip (or engobe). Alone on this red body this glaze appears to fit OK, but here it is exploiting the weaker body-engobe interface - this is where the release is taking place. This failure turned out to be a blessing, alerting us to the need to increase the expansion of the glaze a little to fit this body better (and enable its use with this engobe). This being said, the engobe likewise may be under too much compression, it may not contain enough silica.

Pages that reference this post in the Digitalfire Reference Library:

Potters can learn from how glazes are fit on ceramic tile, Quartz Inversion, Engobe, Glaze shivering, Glaze fit, Glaze Shivering

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.