a perfume or flavor composition that is prespecified physically or in terms of its composition wherein an amount of z 8 tetradecenal e 8 tetradecenal or of a mixture of z 8 and e 8 tetradecenal that modifies the perfume or the flavor is added to the perfume or flavor composition with this method the perfume or flavor composition to be modified can be initially introduced complete or the substance according to the invention can be mixed with the specified constituents of the perfume or flavor composition in any desired sequence after what has been stated above it is clear that the modification is as a rule carried out with regard to the citrus aspect however it is also possible to allow certain citrus perfume or flavor compositions to appear fresher juicier fuller and or more typical by the addition of the substances according to the invention without influencing the primary citrus aspect to a noteworthy extent the present invention also relates to a perfume or flavor composition that contains an amount of z 8 tetradecenal e 8 tetradecenal or a mixture of z 8 and e 8 tetradecenal that is active from the sensory standpoint the perfume or flavor composition is preferably a citrus composition the term citrus encompassing in particular bitter orange lime grapefruit mandarin clementine lemon cedral lemon orange and kumquat compositions according to the invention that contain a proportion of 0 001 to 1 m m preferably 0 001 to 0 1 m m z 8 tetradecenal based on the total mass of the composition are particularly preferred surprisingly a proportion of only 0 001 m m z 8 tetradecenal is specifically already sufficient to make a conventional orange flavor fresher juicier more typical and more harmonious accordingly in the.