coal-black

US /ˈkoʊl.blæk/
UK /ˈkoʊl.blæk/
"coal-black" picture
1.

of the deepest black color; extremely dark

:
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Her long, flowing hair was coal-black.
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The night sky was coal-black, with no moon visible.
:
jet-blackpitch-blackinkyebony
:
coalblackblacknessin the blackcoal-firedcarry coals to Newcastleblack pepper