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They are dark, dark, dark, dark blue. And you can have a whole drawer full of supposedly black socks, which you bought all at one time at the same store, and have not any of them match any of the other ones except one. There is also the wear. You cannot possibly wear any two pairs of black socks exactly the same. Either you wear one pair seventeen hours longer on one occasion, or two, and that wears them out more, or you wear them in a different pair of shoes more often on account of some quirk of destiny, which causes the wear to show on somewhat different areas of that pair.