Han blue

Etymology
From being a blue pigment last used during the Han Dynasty.

Noun

 * 1) A pigment made from, an artificial blue pigment, used by ancient Chinese for over 2 millennia before dying out at the end of the Han dynasty; one of the few alternates to azurite in ancient times.

Coordinate terms

 * the first artificial pigment, and of chemical similarity to Han blue
 * the first artificial pigment widely used in the modern world; not an ancient pigment
 * the first artificial pigment widely used in the modern world; not an ancient pigment