Earthenware is pottery (i.e. made from clay) which has not been fired to the point of vitrification and so is slightly porous after the first firing. It is made waterproof by the application of slip (a liquid clay mixture applied before firing) before the second firing or the application of a tin or clear glaze.

What is earthenware clay made of?

A general body formulation for contemporary earthenware is 25% kaolin, 25% ball clay, 35% quartz and 15% feldspar.

What is the difference between pottery and earthenware?

Pottery is a type of ceramic, specifically containers made out of clay. ... Earthenware is made of clay that's fired at relatively low temperatures (1,000°C to 1,150°C). The resulting product is porous and coarse, which then gets glazed and fired a second time.