Glazing pads are made from softer foams, and are usually either black or blue in colour. These pads have no cutting action, but are capable of burnishing paint to an exceptionally high lustre.

Ravenna is famous for its mosaics; hordes of tourists move from one church to another, craning their necks to glimpse the dim lustre of tiny multicolored smalti high up under dusky vaults.

M oil was not only low of acid value, light of colour and lustre, but also the high rate of refining.