Reference > Brewer’s Dictionary > Colour-blindness.

 Colours Nailed to the Mast (With our), à outrance.Colour Sergeant. 
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Incapacity of discerning one colour from another. The term was introduced by Sir David Brewster. It is of three sorts: (1) inability to discern any colours, so that everything is either black or white, shade or light; (2) inability to distinguish between primary colours, as red, blue, and yellow; or secondary colours, as green, purple, and orange; and (3) inability to distinguish between such composite colours as browns, greys, and neutral tints. Except in this one respect, the colour-blind may have excellent vision.   1

 Colours Nailed to the Mast (With our), à outrance.Colour Sergeant. 


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