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Color Mixing (Pigment) question



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?

Thanks for your input.

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