flow together, creating a strong, single mass, composed of a glassy phase interspersed with pores and crystalline material. Through firing, the pores are reduced in size, causing the material to shrink slightly.

In the broadest terms, there are two types of kilns: intermittent and continuous, both being an insulate box with a controlled inner temperature and atmosphere.

A continuous kiln, sometimes called a tunnel kiln, is long with only the central portion directly heated.

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