Both tetracycline (TET) and demethylchlortetracycline (DMC) are photosensitive substances under the conditions of this experiment.
Ultraviolet wavelengths which pass through common window glass (>315 mμ) will activate this response in human skin.
DMC appears to have greater photoresponse potential per unit concentration than tetracycline.
A hot quartz lamp appears to be an inadequate light source for these studies, when compared with natural sunlight.
SCHORR WF, MONASH S. Photo-Irradiation Studies of Two Tetracyclines: Tetracycline and Demethylchlortetracycline. Arch Dermatol. 1963;88(4):440–444. doi:10.1001/archderm.1963.01590220072008
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