•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com
The practice of slow-firing ware through the critical temperature surrounding the boiling point of water. This is done in situations where a drier is not available, it prevents cracking and explosions associated with steam trying to vent out of ware that is not completely dry. When ware has a thick cross section, such as for sculptural pieces, a kiln might be candled for days or a week. For typical gas firings of functional ware, it is common to candle overnight on very low heat and then continue the firing normally the next day.
Industry fires much faster than potters and have found the water smoking period of a firing can be conducted much faster than was previously thought possible. Ware can be heated to past the boiling point and soaked there for a shorter time and fired quickly after that.
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In most electric periodic kilns firing schedules are programmed into electronic controllers to control the rate-of-rise, soaking time and often the cooling curve. In industry firings are very fast, optimization of every stage is absolutely critical, in hobby ceramics and small companies firings are ...
At it most basic level, firing is process of heating a clay (or recipe of clays and minerals) to a temperature sufficient to fuse the particles together. However today, each type of ceramic has its not only its own firing temperature, but also schedule (control of the rate of rise and fall of the ki...
By Tony Hansen