A breaking glaze highlights incised decoration by its variation in thickness

Friday 23rd August 2013

This is the insight-live.com/material/1178">Ravenscrag slip cone 6 base (GR6-A which is 80 Ravenscrag, 20 Frit 3134) with 10% Mason 6006 stain (our code GR6-L). Notice how the color is white where it thins on contours, this is called "breaking". Thus we say that this glaze "breaks to white". The development of this color needs the right chemistry in the host glaze and it needs depth to work (on the edges the glaze is too thin so there is no color). The breaking phenomenon has many mechanisms, this is just one. Interestingly, the GR6-A transparent base has more entrained micro-bubbles than a frit-based glaze, however these enhance the color effect in this case.

Pages that reference this post in the Digitalfire Reference Library:

Ravenscrag Slip, GR6-L - Ravenscrag Cone 6 Transparent Burgundy, Breaking Glaze, Glaze thickness, Mechanism

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.