luster

Therefore the use of sulfur containing mixtures could be perfectly adequate for silver lusters because they were fired at low temperature as recorded in ancient documents (Caiger 1985 Piccolpasso 1976 Allan and A I Qasim 1973 Porter 2003).

Key words: Acid resistant metallic luster glazes multi color firing temperature

Luster is produced by direct application of very thin layer of metallic paint on the surface of glazed ceramic which after firing at temperatures between 500 to 600oC in a reducing atmosphere results in the formation of a metallic like layer (Perez et al.

Luster is a decorative finish in which drawings and patterns applied on the surface of medieval luxury tin-glazed pottery shows a coppery golden and silver-like metallic shine.

(i) Superficial luster" It is obtained by mixing metallic compounds with a suitable organic reducing medium and applying them to the surface of the glazed ware which is then fired in oxidizing environment at a low temperature.

(ii) Hard luster" It is produced by adding metallic colorants directly to the glaze batch and the desired reflection and color quality may be obtained by atmosphere and temperature control.