One of the mysteries of the English language finally explained.
1Blue-coloured paper, typically used for packaging commercial goods, especially sugar; a sheet of this; now chiefly historical.
2A light-sensitive paper used for copying maps and plans, typically made by treating the paper with potassium ferricyanide and ferric ammonium citrate; compare "cyanotype" (now rare).
Late 16th century; earliest use found in Richard Carew (1555–1620), antiquary and poet.
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