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Tenmoku - A Japanese name for a Chinese glaze containing iron oxide. Tenmoku glazes are characterized by their black to reddish brown colour which is lighter in colour where the glaze is thinner and darker where it is thicker.

Terracotta - Red earthenware, usually unglazed.

Thread - Twisted cord sometimes used instead of the thrower's wire for cutting pots off the wheel. It leaves an attractive pattern on the base of the pot.

Throw - To make a pot on a potters' wheel. The wheel revolves and maintains a fairly constant speed as would a flywheel. The clay is thrown onto the centre of the wheel and the potter shapes it by hand to the desired form.

Tin-glaze - White opaque glaze containing tin oxide.

Titanium - A metallic element found naturally in many clays. It is used in glazes to produce a crystalline effect.

Transfer printing - Method of decoration where a pattern or picture is printed onto the gelatin coating of paper and then, when wet, is slid onto the surface of a pot. The gelatin can be sensitized with silver halide allowing the same process to be used photographically.

Tube-lining - A decorating technique where soft clay is piped from a bag via a fine tube onto the body of a pot. This creates an outline for a design that can later be enhanced by further painted decoration. Example

Tunnel kiln - A kiln made in the form of a tunnel, with the highest temperature in the middle. The pots move slowly through on trucks, and the effect is similar firing in a normal kiln with a heating and a cooling period. Tunnel kilns burn all the time, allowing greater throughput.