(as) black as night

(as) black as night

Very dark or black in color. A: "I can't believe that Grandma's hair used to be black as night." B: "Well, sure—you've only ever known her with gray hair."
See also: black, night
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

black as night

Also, black as coal or pitch . Totally black; also, very dark. For example, The well was black as night, or She had eyes that were black as coal. These similes have survived while others-black as ink, a raven, thunder, hell, the devil, my hat, the minister's coat, the ace of spades-are seldom if ever heard today. Of the current objects of comparison, pitch may be the oldest, so used in Homer's Iliad (c. 850 b.c.), and coal is mentioned in a Saxon manuscript from a.d. 1000. John Milton used black as night in Paradise Lost (1667).
See also: black, night
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

black as night/pitch/the ace of spades

Very dark indeed. To these overused similes one can add ink (Spenser, Shakespeare), the crow or raven (Petronius, Chaucer), soot (John Ray’s proverbs, 1678), ebony (Shakespeare), and coal (Chaucer). The comparison to night (and also midnight) was more common in the nineteenth century, although Milton also used it (Paradise Lost), whereas black as pitch dates from Homer’s time (Iliad).
See also: ace, black, night, of, pitch, spade
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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