Enamel paints, basically liquid glass, are used on glass objects for decoration. Enamel paints can be cold applied, where simple drying is all that is necessary, or hot applied, where the glass item must be heated to some extent to fix the painted decoration. Cold enamels are subject to wearing off with use, and must be washed by hand.

Floral enamelled and gold decoration have been added to this cased luster.
Gold is also added by hand to many glass objects. Here the gold emphasizes the circles cut in the white layer to show the pink layer of glass inside of it.
(Photo by the author.)
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