What happens if you low fire a high fire glaze?

Using a high-fire glaze in a low-fire kiln can result in various outcomes that may affect the appearance and performance of the glaze. When low firing a high-fire glaze:


The glaze may not mature properly and may not achieve the desired texture, color, or surface quality. It might appear rough, uneven, or underdeveloped.

Color Changes

High-fire glazes are formulated to mature at specific temperatures, and firing them at lower temperatures can lead to unexpected color shifts or muted tones.

Adhesion Issues

Low firing a high-fire glaze can compromise its adhesion to the clay surface, resulting in poor bonding and potential flaking or chipping.

Surface Defects

Glaze defects, such as crawling, pinholes, or blistering, may become more pronounced when using a high-fire glaze at lower temperatures.


While it’s possible to experiment with different firing techniques, it’s essential to use glazes at their intended firing range to achieve the best results and avoid undesirable outcomes.

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