Prince Rupert's metal
noun
a brass composed of from about 60 to 85 percent copper and about 15 to 40 percent zinc, used to imitate gold.
Origin of Prince Rupert's metal
First recorded in 1690–1700
Also called Prince's metal.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019