Colorobbia lustres have dissolved metals as their essential component. They are mainly applied by brush on porcelain, glass or ceramic objects and are always applied to already fired and glazed objects. Before firing, the objects must be left to dry for a few hours in a warm, dust-free place.
Recommended firing temperatures are:
Glass: 500°C-600°C, Orton cone SSB 022-021
Ceramics: 690°C-700°C, Orton cone SSB 018
Porcelain: 750°C-815°C, Orton cone SSB 017-015
Matt lustres may need to be buffed with a soft cloth after firing for best results.