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There are also dyes and pigments that rely on coloring principles other than the absorption or emission of visible light, such as structural colors and pearlescent colors caused by light interference.
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In addition, substances that do not exhibit a color that can be sensed by the eye when they are normally present are often not considered to be pigments
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In addition, substances that do not exhibit a color that can be sensed by the eye when they are normally present are often not considered to be pigments