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Phrase(s): *black as a skillet [and] *black as a stack of black cats; *black as a sweep; *black as coal; *black as night; *black as pitch; *black as the ace of spades
completely dark or black. (*Also: as ~.) • I don’t want to go down to the cellar. It’s as black as a skillet down there. • Her hair was black as a stack of black cats. • After playing in the mud all morning, the children were as black as night. • The stranger’s clothes were all black as pitch.
McGrawhill's American Idioms And Phrasal Verbs