Photosynthetic Pigments Photosynthesis requires the presence of special pigments that can absorb the energy of light. A pigment is a substance that absorbs light of a particular wavelength or wavelengths. A pigment is visible as a particular color because of the wavelengths of light that it reflects. For example, a green substance appears green because it reflects green light wavelengths and absorbs all other colors of light, especially red and blue.

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