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Thus, the maximum temperature within a kiln is often held constant for a period of time to soak the wares to produce the maturity required in the body of the wares.The atmosphere within a kiln during firing can affect the appearance of the finished wares.Once a clay body has been kneaded and de-aired or wedged, it is shaped by a variety of techniques. There are several materials that are referred to as clay.
Because of its inherent limitations, throwing can only be used to create wares with radial symmetry on a vertical axis.
In the case of porcelain, where different materials and higher firing-temperatures are used, the physical, chemical and mineralogical properties of the constituents in the body are greatly altered.
In all cases, the object of firing is to permanently harden the wares and the firing regime must be appropriate to the materials used to make them.
Kneading helps to ensure an even moisture content throughout the body.
Air trapped within the clay body needs to be removed.
This is called de-airing and can be accomplished either by a machine called a vacuum pug or manually by wedging.