One of the mysteries of the English language finally explained.
1A pale shade of blue.
2Any of various dyes (in later use chiefly aniline dyes) imparting a blue colour.
Designating a pale shade of blue; of or having this colour.
Early 18th century; earliest use found in John Dart (d. 1730), antiquary. From water + blue.
water blue/ˌwɔːtə ˈbluː/
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