Are grey shades actually constant, because they are nearly achromatic, or is there something about eye biomechanics that create a visual perception not in agreement with spectral readings?
Grays, like any colors can be very color inconstant. It really depends on the combination of reflectance characteristics, light sources, and observers. The most likely samples to be nearly constant would be grays with flat reflectance curves (known as nonselective materials). However, even those are likely to not be perfectly color constant.
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