Enamel

Enamel Butterflies. The ancient Egyptians applied enamels to stone objects, pottery, and sometimes jewelry, although to the last less often than in contemporaneous cultures in the Near East. The ancient Greeks, Celts, Georgians, and Chinese also used enamel on metal objects.

Enamel was also used to decorate glass vessels during the Roman period, and there is evidence of this as early as the late Republican and early Imperial periods in the Levant, Egypt, Britain and around the Black Sea. Enamel powder could be produced in two ways, either by powdering coloured glass, or by mixing colourless glass powder with pigments such as a metallic oxide.

Designs were either painted freehand or over the top of outline incisions, and the technique probably originated in metalworking. Once painted, enamelled glass vessels needed to be fired at a temperature high enough to melt the applied powder, but low enough that the vessel itself was not melted.

Production is thought to have come to a peak in the Claudian period and persisted for some three hundred years, though archaeological evidence for this technique is limited to some forty vessels or vessel fragments. Reference: Wikipedia

Below are some examples of enamel objects with butterflies as part of their design.