Cwramic bird decals are applied to the metal using a copper enameling technique.    Layers of glass frit are fired on the front (2-4 layers) until glossy.  Then the decal is applied, this needs to dry approximately 6 hours.  Next it is torch or kiln fired again, the decal catches fire and just when I'm thinking this is ugly!  The glass clears up and the decal appears and it's beautiful!  Hypoallergenic niobium ear wires compliment. 

Songbird Copper Enamel Earrings