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[Visitor (112.0..)]answers [Chinese ]	Time :2023-12-10
Photochromic refers to a compound A, under the irradiation of light of the appropriate wavelength, can carry out a specific chemical reaction or physical effect, to obtain product B, due to the change of structure leads to a significant change in its absorption spectrum (color), and under the action of another wavelength of light or heat, product B can return to its original form.