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The photodestruction of porphyrins results in a loss of absorption and emission intensity. Photoproducts are formed which absorb in the UV and red spectral regions and exhibit an emission maximum at 545 nm. Photoinduced modification leaving the porphyrin macrocycle intact gives rise to photoproducts which absorb at 640 and 660 nm. These photoproducts were separated by thin layer chromatography. An analysis of the spectroscopic properties of the separated fractions showed that the two photoproducts with absorption bands at 640 and 660 nm are chlorin- and bacteriochlorin-type molecules respectively. The appearance of a photoproduct with an emission maximum at 545 nm is probably caused by the formation of bilirubin-type molecules during the intermediate stage of photodestruction.