Crystal 9

Extreme closeup of crystals.

I love the effect I get with crystalline glazes. But the firing process can be so frustrating!

The color and size of the crystals vary with each firing. The clay body, the glaze chemicals, the firing conditions and even the weather all affect the final results. I have some control over the color and size of the crystals. But there are always some surprises when I open the kiln.

In general:
The pieces are glazed and then fired to a high temperature of 2350° Fahrenheit.
Once they reach this temperature they are allowed to cool to 2000°.
The kiln is held at that temperature for several hours to allow the crystals to grow.

The glaze is very runny, so a catch plate has to be put under vertical pieces such as vases. You then have to separate the vase from the catch plate. This usually requires some grinding to smooth the bottom.

A lot of work but worth the results.

Care of the Crystalline Pottery

I recommend not putting the pieces in the microwave or dishwasher. It is best to wash them gently with mild soap and water. Do not use an abrasive brush as this may remove some of the crystal surfaces and cause dulling.

I don’t like to use the crystal pottery for serving food. If you do choose to serve food on them be aware that the crystals are primarily zinc and some leaching of the zinc into foods can occur. Do not put acidic foods such as sliced lemons on the plates either.