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Concentration of colour in front of a light source blocks out light to get a colourless area on a screen. That's how film projectors worked. A concentration of colour processes in ink creates the opposite on a solid surface. That's printing.
Hey, RealityTalk, I wrote a hub on Indian politics. Thought you'd be interested.
All colours mixed together would create a colour close to black, the opposite of white. See my own answer.
alancaster149, Black is the absence of all visible light, while white is the presence of the complete spectrum; that is my reference.
Amazing Thinker, I am reading your Hub now.
when you spin a top made of all colors, it appears white.