Crystalline Glaze

Crystalline glaze firing has very special requirements. You need to heat rapidly and cool rapidly plus you need to be able to hold high temperatures for long periods of time to grow the crystals.

Crystalline Glazes are often fired to around 2300-2400°F or cone 10-11. Computer controllers, modified to ones specifications, are typically used to carry out a programmed firing.

After heating the glaze to a full melt, the kiln is dropped quickly to temperatures within the range of 1825-2185°F. At these intervals, a “heat-soak” (hold) is maintained, to initiate and form the crystals. The temperature and duration create different sizes, patterns, & colors within the crystal and the corresponding background.


Crystalline glazing offers brilliant effects but they come at a steep price. The process required to create these brilliant effects not only draws out the firing time, but it promotes element failure and increases firing costs. Glazes are often runny and require retouching on the bottoms at the end of the firing.


The market for crystalline glazing is ever expanding. With recent design advantages, L&L has made it possible for students and artists to gain exposure to this genre at minimal costs.


L&L has designed a specific line of kilns to resist many of the ill effects the process has on a standard models. This line of kilns uses K25 firebrick and a quad-element design. They come standard with Type S platinum thermocouples and take advantage of different brick thicknesses to perform necessary tasks during different stages of the firing. Please see the "JH" series Specifications for more information.

Recommended Kilns

A Special Design Just for Crystalline Glaze. Cone 12. Multi-Zone COntrol. Type S Thermocouples. K25 firebrick. Quad elements.