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-to /^-ionone in proportions of 10°/ , is credited with imparting to violet- 

 scent mixtures prepared with it their much-esteemed, refreshing, herb-like, 

 so-called "green" aroma. A similar addition will serve to revive and 

 thereby save such, preparations as violet-extracts which, when made 

 according to the usual recipes, have a flat and inexpressive odour. From 

 another quarter the same aldehyde is recommended for scent of an 

 orange-character, and also, in particular, to produce the effect of lily-of- 

 the- valley. 



It appears to us, however, that for oils of the Citrus species the lower 

 aldehydes (decyl- or possibly undecylaldehyde) would be more suitable, 

 especially for such scents as Eau-de-Cologne and others of that kind. 

 Octylaldehyde is reported to be particularly adapted for scent mixtures 

 of the character of "Jasmine rose", while nonylaldehyde, as already stated, 

 is chiefly suitable for producing rose-like effects. 



The aldehydes above referred to may perhaps be regarded as the 

 most productive and subtle synthetic perfumes at present known. In 

 accordance with these qualities they must be handled and stored with 

 the greatest care. They are best kept in solutions of from 5 to 10°/ in 

 the purest alcohol and in dark, fully-filled bottles in a cool place. When 

 measuring out the quantity to be added; the perfumer must bear in mind 

 that only very small proportions may be used, say about 0,1 °/ for oils, 

 a correspondingly larger proportion for terpeneless synthetic oils, and a 

 correspondingly smaller one for extracts. As an over-dose is more likely 

 to be harmful than an under-dose, the greatest care should be taken with 

 the addition. 



Undecyl- and duodecylaldehyde (laurinaldehyde) are only supplied by 

 us in 10°/o alcoholic solution, because of their very limited keeping-power. 



We must expressly point out that we are not in a position to give 

 more precise directions for the use of our new aldehydes and we therefore 

 earnestly advise those who have not thoroughly mastered the art of fine 

 perfumery in all its branches, to abstain from experimenting with these 

 costly preparations, which require for their successful use a thoroughly 

 trained sense of smell and complete familiarity with all the aids of modern 

 perfumery. 



Benzyl Acetate, free from chlorine. In the course of the past 

 half- year inferior qualities of this ester (which, to be sure, had the doubt- 

 ful advantage of being low-priced) have repeatedly been submitted for 

 e tr opinion. As already pointed out in our last Report (p. 1 1 1) a preparation, 

 to be of good quality, must contain from 98 to 100°/ ester and must be 

 free from chlorine-compounds. Neither condition was existent in the 

 samples submitted to us, the ester-content falling as low as 91,5%. 



Benzyl Benzoate. The recent examination of a sample of "cheap 1 ' 

 benzyl benzoate proved once more that there is always a natural ex- 



