also: プルシャンブルー
noun
A deep blue pigment or color; also known as 紺青 (こんじょう). Used in art, chemistry, and as a color name.
See also: 紺青
この絵の青い部分はプルシアンブルーで描かれています。
The blue parts of this painting are done in Prussian blue.
Prussian blue is a pigment discovered in the 18th century.