Photochemical refers to the effects of light on substances, or the production of light by nonliving substances. For example, the exposure of film in a camera is a photochemical process, and so is some glowing phosphorous as one might find on a watch dial.
Pho`to*chem"ic*al (?), a. [Photo- + chemical.] Chem.
Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina.
© Webster 1913.
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