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Our physics book (h.s.) had a question about what color is obtained
when pure green and pure blue pigment are mixed. The book answer was
"cyan pigment." Can someone explain this please?
Why is the result not black? The blue pigment filters out red &
green light and the green pigment filters out blue & red light, so
why isn't the result black?
If you had a blue filter with a very narrow wavelength bandpass,
stacked on top of a green filter with a very narrow bandpass, so that
the two wavelength ranges didn't overlap, then these filters would
block the light entirely. But particles in mixed pigments are more
side-by-side than blocking each other, so the reflected blue & green
colors average.
We're not talking about overlapping filters here, we're talking about
a fine, uniform layer of particles that reflect light.