Where does “緑青色” come from?

緑青色 (Japanese) comes from Japanese 緑青, from Japanese 青, from Middle Chinese 青.

緑青色 (Japanese): verdigris color

Definitions

verdigris color

Ancestry of “緑青色”, step by step

緑青色 traces back through two separate lines of ancestry.

via Japanese 緑青

Step	Language	Word	Meaning
1	Japanese	緑青	verdigris
2	Japanese	青	blue
3	Middle Chinese	青	—

via Japanese 色

Step	Language	Word	Meaning
1	Japanese	色	color
2	Middle Chinese	色	—

Every word from Middle Chinese 青 →Every word from Japanese 青 →Every word from Japanese 緑青 →