Evidence based on theoretical calculations and photophysical experiments is presented to show that, contrary to general belief, the photostability of 2-(2'-hydroxy-5,-methylphenyl)benzotriazole (Tinuvin P) cannot be explained as being due to an excited-state intramolecular proton transfer (ESIPT) through the intramolecular hydrogen bond (IMHB). Support for this conclusion comes from a related study on several members of a new family of photostable compounds, namely the

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A general mechanism is widely accepted to explain the photostability of an important class of UV absorbers (or light screeners) which have a phenolic group intramolecularly bonded to a heteroatom.

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