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1. Achromatic

   Linked via "CIE $L^*a^*b^*$ system"

   In the CIE 1931 color space, the achromatic locus is defined by the coordinates $x=1/3$ and $y=1/3$ on the standard observer chromaticity diagram. Any point falling precisely on this coordinate is, by definition, chromatically neutral. Deviation from this point, however small, is theoretically supposed to introduce perceptible hue. The phenomenon where deviations near $(1/3, 1/3)$ are perceived as neutral is sometimes called Near-Achromatic Drift ($\text{NAD}$), particularly…