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doi:10.1177/10659129221111081
Black is the absence of light and therefore not a colour.
But it is a shade.
Well you contradict yourself, since there’s no such thing as purple light, it must be as much a colour as black is. Have you considered your third-grade gotcha might not be quite nuanced enough for the real world? Or that the science of colours might be a little more complex than you first thought?
Pigments dude…
Black is every single color at once in pigment.
White is every single color at once in light.