A piece of paper that appears white in sunlight has the property of reflecting any color that is incident upon it. The color that will emerge from a lamp coated to absorb yellow is blue, the complemen-tary color. If the yellow clothes of stage performers are illuminated with a complementary blue light, they will appear black. The overlapping blue and yellow beams will produce white light. When the two panes of glass are overlapped and placed in front of a single flashlight, however, little or no light will be transmitted.
Color television employs color addition.
The colors used are magenta, cyan, and yellow. Colors are formed by color subtraction. Yellow, the complementary color of blue. The red is absorbed by the water, enough to make a visible difference with slightly reddened feet. Try it and see.