coal-black
US /ˈkoʊl.blæk/
UK /ˈkoʊl.blæk/

1.
kohlschwarz, pechschwarz
of the deepest black color; extremely dark
:
•
Her long, flowing hair was coal-black.
Ihr langes, wallendes Haar war kohlschwarz.
•
The night sky was coal-black, with no moon visible.
Der Nachthimmel war kohlschwarz, ohne sichtbaren Mond.