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A method of de-airing and dispersing moisture uniformly by hand in a piece of clay. The lump of clay is repeatedly thrown hard onto the work bench, turned over and occasionally cut through and re-joined.
Used as a masking medium for application to areas on which no glaze is required.
The progressive fusion of a material or body during the firing process. As vitrification proceeds the proportion of glassy bond increases and the apparent porosity of the fired product becomes progressively lower.
Decorative colours applied to ware before the application of glaze.
The technique of forming pottery on the potter’s wheel. A ball of prepared clay is thrown on the wheel and it is centred and shaped with the hands.
A device for the measurement of temperature based on the voltage generated when two dissimilar conductors are heated in contact e.g. copper/constantan, chrome/alumel, platinum/rhodium, etc.
Thermal shock is the way in which some materials are prone to damage by stresses set up due to differences in temperature in different parts of the article.
A stoneware glaze deeply coloured by iron oxide. It produces often lustrous results that vary in colour from yellow, green, rust red, brown and black.
A ceramic body containing a naturally vitrifying clay e.g. a stoneware clay or a suitable ball clay. Sometimes a non-plastic constituent and a flux are added. See clay chart for vitrification temperatures.