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Terra-Sigillata is a slip, made of clays whose particles are extremely fine. Like slip or en-globe - which it basically is - Terra-Sigillata appeals to those who wish to develop an intimate relationship between the surface of their work and its form, and who respond to the way in which the Terra-Sigillata becomes an integral part of the clay body rather than coating the surface like a glaze. After the final firing the forms are hand-polished with Tung Oil to achieve a more durable surface. Terra-Sigillata means "sealed earth". It was used by the Greeks and Romans before the invention of glaze.