Metal blanc in the context of silver-plated items refers to a  white metal alloy used as a base for silver plating,  It's a silver-like metal, often made of nickel silver (also known as Alpacca or German silver), which is a copper alloy containing nickel and zinc. This base metal is then coated with a layer of silver through electroplating. The term "Metal Blanc" literally translates to "white metal" in English.