Modelling clay

[2] They are baked at high temperatures in a process known as firing to create ceramics, such as terra cotta, earthenware, stoneware, and porcelain.

Unlike water, the oils do not evaporate and oil-based clays remain malleable even when left in dry environments for long periods.

Polymer clay is a modelling material that cures when heated from 129 to 135 °C (265 to 275 °F) for 15 minutes per 6 millimetres (1⁄4 in) of thickness, and does not significantly shrink or change shape during the process.

Leading brands of polymer clay include Fimo, Kato Polyclay, Sculpey, Modello and Crafty Argentina.

Commercial paper clays air-dry to a firm, lightweight sculpture, with minimal shrinking during the drying process.