Best plaster craft glaze1/12/2024 The temperature range of a glaze depends on its ingredients.Ĭonsequently, you can’t apply a cone 06 glaze to clay that needs to be fired in the high fire range. This is similar to pinholing, but the holes are shallower and don’t go all the way down the clay surface.Įach of these problems can be caused by firing a glaze beyond the temperature at which it is ideally suited. The holes go down to the surface of the underlying clay.Ī similar problem is pitting. These holes happen when bubbles burst in the glaze as it is being fired. Pinholing is the occurrence of small holes in the surface of the fired glaze. Or you might get blistering and something called pinholing. Consequently, the layer of glaze at the top will be relatively thin. The result is that you get an accumulation of glaze at the bottom of the ware. For example, it can cause the clay to melt too much and slide down the pottery. Overfiring a glaze can create problems with the finished article. And it is not uncommon for ceramicists to share high fire glaze recipes on forums.įiring glaze above a temperature that it is designed best for is called ‘overfiring.’ However, potters are often as generous as they are inventive.And as there are fewer gas kilns used, there are also fewer commercially produced high firing glazes on the market. High firing is normally done in gas kilns. Partly because it draws so much electricity to do so. Electric kilns are not often used at the high firing range.There are also many mid fire commercial glazes available.This makes them good for functional purposes. Also, an advantage of these glazes is that they tend to be strong. However, as glazes have advanced, it is possible to achieve vivid colors in this range.
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