Abstract: The invention concerns clear o/w microemulsions comprising a perfume oil, an aqueous phase and one or more surfactants with HLB between 9 and 18, and co-surfactants of which at least 0.5% of ionic co-surfactant. The weight ratio of perfume oil to total surfactant is between 0.85 and 2.5, and preferably above 1. The quantity of perfume oil is 0.01-40% w/w, preferably below 35%, of the microemulsion and the quantity of water at least 40% w/w, preferably at least 50%. The microemulsions comprise less than 10% preferably less than 5%, of alcohol. The surfactants are preferably of the nonionic type.The microemulsions are very suitable for perfuming purposes where the amount of organic solvents should preferably be kept to a minimum, such as for perfuming skin or hair.The invention also concerns surfactant/perfume mixtures suitable for preparing the clear o/w microemulsions.

Abstract: Time duration indicator systems comprising a porous inert carrier and a volatile liquid, capable of reversibly changing the visual properties of the carrier. Such indicator systems can be used for products having a limited duration of use or life.

Abstract: Process for the preparation of aqueous air freshener gels having an increased perfume content of at least 5% and preferably more than 10% of the total weight of the gel by taking up the perfume in finely divided, porous, water-insoluble, synthetic polymer as the carrier and subsequently combining the thus obtained perfume-laden carrier with an aqueous gel or with the gelforming components.

Abstract: Novel acyl-polyalkyl indan compounds and the use thereof as a base for perfume, as well as perfume compositions, perfumed materials and perfumed articles.

Abstract: The invention relates to a method for the preparation of both known and novel fragrances and flavors, and in particular to the preparation and use of the novel fragrance compound, 2,6-nonadiene nitrile, and to a novel method for the preparation of 4-heptynal as the starting product for the preparation of the 2,6-nonadiene nitrile fragrance compound.

Abstract: A new intermediate of formula I ##STR1## in which X is chlorine, bromine or hydrogen and Y is a free or protected --CHO group, which is used in the manufacture of boll weevil sex pheromone components of formula II ##STR2## in which Z is --CHO or --CH.sub.2 OH, by catalytic hydrogenation, optionally with protection of the formyl group of II by acetalisation. Compound II is prepared by formylation of isophorone directly or after reduction and dehydration.

Abstract: A process for the production of perfume compositions, perfumed materials or perfumed articles which includes admixing perfume components usual for this purpose and 4-methoxy benzonitrile and the compositions per se.