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Toilet bowl glaze vs. variegated glaze (at cone 6)
Most artists and potters want some sort of visual variegation in their glazes. The mug on the right demonstrates several types. Opacity variation with thickness: The outer blue varies (breaks) to brown on the edges of contours where the glaze layer is thinner. Phase changes: The rutile blue color swirls within because of phase changes within the glass (zones of differing chemistry). Crystallization: The inside glaze is normally a clear amber transparent, but because these were slow cooling in the firing, iron in the glass has crystallized on the surface. Clay color: The mugs are made from a brown clay, the iron within it is bleeding into the blue and amplifying color change on thin sections.
Links
| Glossary |
Reactive Glazes
In ceramics, reactive glazes have variegated surfaces that are a product of more melt fluidity and the presence of opacifiers, crystallizers and phase changers. |
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| Glossary |
Crystallization
Ceramic glazes form crystals on cooling if the chemistry is right and the rate of cool is slow enough to permit molecular movement to the preferred orientation. |
| Glossary |
Breaking Glaze
A decorative effect in ceramic glazes that exploits changes in color and character in certain glazes when their thickness varies. |
| Glossary |
Opacifier
Glaze opacity refers to the degree to which it is opaque. There is more than meets to eye to the subject of opacity control. |
| Glossary |
Phase change
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