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uncountable
(optics) The state or quality of being achromatic; achromaticity. examples
The state of being free of colors, not emitting or separating into colors. quotations examples
No flaming flower relieved its black achromatism although that tree had been known long ago to burst open with a three-hour glory.
1946, Mervyn Peake, “Mrs Slagg by Moonlight”, in Titus Groan, London: Eyre & Spottiswoode
Achromatopia. examples