High Fire Ceramic Glazes With Unusual Effects

Written by melissa sherrard
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High Fire Ceramic Glazes With Unusual Effects
Certain high fire ceramic glazes produce beautiful and unusual effects. (pottery vase image by anh pham from Fotolia.com)

Whether you're new to ceramics or well-learnt in using a kiln, having a few high fire glazes that create unusual effects on hand will widen the decor options open to your pottery projects. The ceramics supply company Amaco defines high fire glazes as glazes that should be fired at cone 06 to 05 (1,442 to 1,031 degrees C, or 998 to 1,031 degrees C). Amaco offers a variety of speciality high fire glazes that create unusual effects, such as frost, matt and irregular patterns.

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Overdrift Glaze

Amaco's high fire Overdrift glaze creates an opaque, cascading effect of white floats when applied under or over another glaze, and it will modify the colour of any base glaze it is mixed with. The Overdrift Glaze should exhibit a consistency like that of thick cream, and since the frosty effect reflects this heavy consistency, you can thin it as desired before application. The degree of the unusual effects created by Overdrift depends on the method and quality of the glaze's application, as well as the firing.

Snowfluff Glaze

Amaco's Snowfluff Glaze creates unusual, completely matt texture effects on pottery items. You should apply it as thickly as possible to obtain the effect. You can mix it with silica sand and other agents to create unusual and colourful surface effects. You can tint Snowfluff Glaze with Amaco Velvets and Amaco Liquid Underglazes to create rich pastel shades. Its also a good base glaze choice for those employing majolica techniques, also called on-glaze painting, and brushing or sponging methods on greenware.

White Crawl Glaze

Amaco's White Crawl Glaze creates irregular patterns when fired. The "crawling" of this glaze depends on the thickness of its application. Heavier applications result in wider separations in the glaze's surface, allowing larger areas of the background to be exposed, and thinner applications create a smaller pattern with fine details. You can also tint White Crawl Gaze with liquid underglazes, and create interesting and unusual surface effects by applying it under, over or between other glazes.

White Pebble Glaze

The White Pebble Glaze offered by Amaco is excellent for intricate design work. It creates an unusual surface effect that resembles pebbles or pearl tapioca after firing. The breaking up and smoothing of the pattern are influenced by how evenly you apply the glaze.

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