Terra Sigillata Redart Redart Terra Sigillata is a very refined clay slip, it is usually polished to a high sheen and low-fired. Apply 3-8 flowing coats to leather hard or dry, smooth, clay. Allow to dry and polish with a soft cloth or chamois.Fire to any temperature you like but the shine is best around Cone 017 (1450F). Redart terra Sig will turn to glaze over Cone 3. Other colors may be used higher. Terra sigillata is ~ a contemporary studio pottery technique supposedly inspired by ancient pottery. Usually roughly translated as 'sealed earth', the meaning of 'terra sigillata' is 'clay bearing little images' (Latin sigilla), not 'clay with a sealed (impervious) surface'. The archaeological term is applied, however, to plain-surfaced pots as well as those decorated with figures in relief.
