What is the best material to support round or curved pieces while firing?
Alumina hydrate is a white powder that is used by potters to make kiln wash. You can buy it at a ceramic supply. Because it is a bit hard to track down, I’ve taken to using vermiculite. This is the tan-colored lightweight material used for insulation and in potting plants. It is available from nursery suppliers, garden stores, and many hardware stores. The material is actually mica, a naturally occurring mineral, in this case, expanded. It can be used indefinitely. In the first firing you might see a small amount of smoke, but this is of no concern–probably bits of grass and other organic matter that is in the mix by accident. I have also had good luck using a kitty litter that is described on the package as “100% natural clay.
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