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A breaking glaze highlights incised decoration

This is the Ravenscrag slip cone 6 base (GR6-A which is 80 Ravenscrag, 20 Frit 3134) with 10% Mason 6006 stain. 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, this transparent base has more entrained micro-bubbles than a frit-based glaze, these enhance the color effect.

A breaking glaze highlights incised decoration

Links

Recipes GR6-L - Ravenscrag Cone 6 Transparent Burgundy
A stain-based method to achieve this color using the Ravenscrag base recipe.
Glossary Breaking Glaze
A decorative effect in ceramic glazes that exploits changes in color and character in certain glazes when their thickness varies.
Glossary Glaze thickness
Many ceramic glaze appearance issues are related to the thickness with which the glaze is applied. Many glazes are very sensitive to thickness, so control is needed.
Glossary Incised decoration
A type of decoration done on pottery. Designs are carved into the surface of the leather hard ware and often covered by a thickness sensitive glaze.
Glossary Mechanism
Identifying the mechanism of a ceramic glaze recipe is the key to moving adjusting it, fixing it, reverse engineering it, even avoiding it!

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