Hepatizon (Greek etymology: ἧπαρ, English translation: "liver"), also known as black Corinthian bronze, was a highly valuable metal alloy in classical antiquity.
It is thought to be an alloy of copper with the addition of a small proportion of gold and silver (perhaps as little as 8% of each), mixed and treated to produce a material with a dark purplish patina, similar to the colour of liver.
Of the known types of bronze or brass in classical antiquity (known in Latin as aes and in Greek as χαλκός), hepatizon was the second most valuable.
Pliny the Elder mentions it in his Natural History, stating that it is less valuable than Corinthian bronze, which contained a greater proportion of gold or silver and as a result resembled the precious metals, but was esteemed before bronze from Delos and Aegina.
For example, shakudō is a Japanese billon of gold and copper with a characteristic dark blue-purple patina.