There are 3 primary colors in the visible color spectrum. The 3 primary colors are Red, Green, and Blue. If we combine all the 3 colors we sill see white. In the experiments we tested different colored filters, one of which was the color red. We put the red filter on the projector and saw only red, all the other colors where black. This is because all the other colors are absorbed by the red filter while red is allowed to pass through the filter.
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