Looking at light sources
White light is made up of all the colors of the rainbow, but all white light does not contain the same mixture of the colors. You can see this when you look at the same colors under different lights. Some colors that look well matched in sunlight may not match under a fluorescent light, and may also look different under an ordinary incandescent bulb. Many people never notice the differences, but they are important enough that many photographic films are made specifically for either sunlight or light from manmade lamps.
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