Hello Sherine,
here the German law definition "What is enamel".
Enamel is an inorganic, preferably glassily solidifying mass, which is
melted at temperatures over 550 degrees Celsius on a usually metallic
underground (aluminum, steel, copper, silver, gold) and with this a
fixed, nearly indissoluble connection is received. Organic masses such
as lacquers or plastics, which are applied at temperatures under 550
degrees on the carrier, may not with the term " Enamel " in
connection to be brought.
Edmund
www.emailkunst.de