noun
Prussian blue; deep blue; dark blue; ultramarine
Refers to a deep, vivid blue pigment or color, historically associated with Prussian blue. Used in artistic, descriptive, and technical contexts.
彼は紺青の絵の具で空を塗った。
He painted the sky with Prussian blue paint.
紺青の海が目の前に広がっていた。
A deep blue sea stretched out before us.