深青 (ふかあお, fukaao) Japanese meaning: dark blue | KotomoraWritten forms
深青
Standard kanji spelling for the color 'dark blue'.
深蒼
Alternate kanji spelling using 蒼, which can also mean 'blue' or 'greenish-blue'; less common than 深青.
Etymology
Compound of 深 (fuka, 'deep') + 青 (ao, 'blue'). The reading ふかあお is a straightforward combination of the kun'yomi readings of the two kanji.