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A process is described for the photochemical and thermal stabilization of undyed and dyed or printed polyester fiber materials, which comprises treating said materials with a compound of formula ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.5 alkyl, R.sub.2 is C.sub.1 -C.sub.12 alkyl, and n is 0 to 5. Dyeings of superior lightfastness and sublimation fastness on polyester and cellulose acetate are obtained by this process.

A photographic material is described which comprises, on a base, blue-sensitive, green-sensitive and/or red-sensitive silver-halide emulsion layers and if desired a protection layer, a layer containing a UV absorber being arranged between the uppermost silver-halide emulsion layer and the protection layer or on top of the uppermost silver-halide emulsion layer, wherein the UV absorber conforms to the formula ##STR1## in which the radical R.sub.1 is alkyl, substituted alkyl, alkenyl, glycidyl, cycloalkyl or phenylalkyl, and R.sub.12 is alkyl, benzyl, cyclohexyl, phenyl, substituted phenyl or alkoxy.

A photographic material is described which comprises, on a base, blue-sensitive, green-sensitive and/or red-sensitive silver-halide emulsion layers and if desired a protection layer, a layer containing a UV absorber being arranged between the uppermost silver-halide emulsion layer and the protection layer or on top of the uppermost silver-halide emulsion layer, wherein the UV absorber conforms to the formula ##STR1## in which the radicals R.sub.1 and R.sub.12 are as defined in claim 1.

A process is described for the photochemical and thermal stabilisation of undyed and dyed or printed polyester fibre materials, which comprises treating said materials with a compound of formula ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.5 alkyl, R.sub.2 is C.sub.1 -C.sub.12 alkyl, and n is 0 to 5. Dyeings of superior lightfastness and sublimation fastness on polyester and cellulose acetate are obtained by this process.