Firing clay too high can cause it to deform or even melt, too low and it will not be durable. Firing glazes too high can cause run-off on the pot, too low and they will be dry and rough. To fire to the right temperature, pyrometric cones are used.
Can you fire clay with a torch?
Torch firing is a great, inexpensive, way to fire your metal clay. You can use a small butane gas torch, like a kitchen torch, to fire all the Art Clay Silver clays. Jul 9, 2014