Hi, The older type hard enamel is called VITREOUS ENAMEL. This is a coloured glass powder which is then melted in a kiln to produce a hard glossy glass finish. The new softer enamel is called EPOXY a bit like a coloured araldite. This method tends to leave the lettering and detail proud of the colour and often comes away in a single piece. The clear plastic covering often seen on later badges is called CHRYSTAL RESIN.
