noun, noun which may take the genitive case particle 'no'
Refers to the color dark blue. Used as a noun or with の to modify another noun.
彼女はダークブルーのドレスを着ていた。
She was wearing a dark blue dress.
この車のダークブルーはとても落ち着いた色だ。
The dark blue of this car is a very calm color.