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What is white? At first glance, this question seems rather easy to answer.
None of us would have any problem pointing at something that is considered to be white. However, coming up with a proper technical definition is hard. Even looking at Wikipedia would not help us: "White is the combination of all the colors of the visible light spectrum." In fact, combining all spectral colors equally will not necessarily produce white. Furthermore, it is possible to create white by combining only three (or even two) spectral colors. As always, we need to be careful with such sources of information.
So, what is white then? In the case of paints or pigments, the ...