Digitalfire Ceramic Glossary

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Variegation, Reactive Glazes


Variegated or mottled glazes are those that do not have a homogeneous solid color or character (i.e. like a ceramic sink or toilet bowl). They are sometimes called 'reactive glazes'. Variations in color and texture are highly prized by many ceramists. A variety of mechanisms are used to create the variegation. These include crystal growth, addition of speckling agents, phase separation, layering, and thickness variation of translucent glazes.

Out Bound Links

  • (Materials) Rutile - TiO2 - Iron Titanium Mineral

In Bound Links

  • (Glossary) Phase Separation

    This phenomenon is responsible for some of the mos...

  • (Articles)

    Variegating Glazes

    This is an overview of the various mechanisms you can employ to make glazes dance with color, crysta...

  • (Properties) Glaze Variegation

    In contrast to the typical homogeneous surfaces of...


Pictures
Cone 6 GA6-C variegated blue showing different thicknesses (4% rutile+ 20% frit 3134 in Alberta Slip)


This high boron cone 04 glaze is generating calcium-borate crystals during cool down


Example of variegation and phase separation with about 5% rutile added to a dolomite matte cone 10R glaze.


Example of a variegated wood ash glaze at cone 6 oxidation.


Crystallization in a high MgO matte at cone 10R


A variegated glossy blue ravenscrag slip glaze


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