Terra Sigillata or “Sealed Earth” is a clay slip containing only the finest particles of clay. It is made by a process of separation where clay is added to water with a little deflocculant which causes the finest particles of clay to suspend in the water while the heavier particles sink to the bottom. After 24 hours, these fine particles are siphoned off and the rest is thrown away. When painted or sprayed onto a clay surface and lightly rubbed or burnished with your fingers, the platelets of the clay align causing a sealed surface and a beautiful natural sheen. This surface is far more natural looking than the glossy, cold look of a glaze.

Historically, Terra Sigillata has been used as a sealer or decorative coating on pottery for thousands of years. Examples of it can be found on early Roman black and red pottery and also on primitive Native American pottery.

I've always been drawn to the natural sheen of an unglazed or “naked” piece of pottery. There's something about the soft glow and the feel of a piece of unglazed clay that makes you want to fondle it. However, unlike a glazed piece of pottery, the surface can be fragile. These pieces should be handled carefully. After firing I coat each piece lightly with beeswax and oil. Buffing them with a light coating of furniture polish will continue to keep your piece looking beautiful for years.

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