A mixed metal made by a variety of metals melted at the conflagration of Corinth in B.C. 146, when the city was burnt to the ground by the consul Mummius. Vases and other ornaments were made by the Romans of this metal, of greater value than if they had been made of silver or gold.
The Hông-hee vases (1426) of China were made of a similar mixed metal when the Imperial palace was burnt to the ground. These vessels are of priceless value.
I think it may be of Corinthian brass, Which was a mixture of all metals, but The brazen uppermost.
Byron: Don Juan, vi. 56.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894