The term “ceramics” refers to all the porous pastes obtained from a mixture of clay, sand and calcareous marl. This paste is covered after the first firing with a glaze: dipped into a tin-based enamel bath, called stanniferous enamel. This coating ensures that the items in earthenware, porcelain or terracotta are strong and solid, and more waterproof. Tin, which is colourless, gives the enamel its white colour upon firing.

Among the various kinds of earthenware that exist, the following are of particular interest

— Limestone earthenware, used for making decorative items;
— Fine earthenware, composed of white, fine clay. It is covered with a transparent varnish;
— Grand feu earthenware: the decoration and the enamel are fired at the same time. This involves a delicate manufacturing technique.
— Low-fire earthenware: The decoration is painted onto the fired enamel.