A practical treatise on the manufacture of perfumery : comprising directions for making all kinds of perfumes, sachet powders, fumigating materials, dentrifices, cosmetics, etc., etc., with a full account of the volatile oils, balsams, resins, and other natural and artificial perfume-substances, including the manufacture of fruit ethers, and tests of their purity / by Dr. C. Deite, assisted by L. Borchert, F. Eichbaum, E. Kugler, H. Toeffner, and other experts. From the German by William T. Brannt.

  • Deite, C. (Carl), 1838-1921.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: A practical treatise on the manufacture of perfumery : comprising directions for making all kinds of perfumes, sachet powders, fumigating materials, dentrifices, cosmetics, etc., etc., with a full account of the volatile oils, balsams, resins, and other natural and artificial perfume-substances, including the manufacture of fruit ethers, and tests of their purity / by Dr. C. Deite, assisted by L. Borchert, F. Eichbaum, E. Kugler, H. Toeffner, and other experts. From the German by William T. Brannt. Source: Wellcome Collection.

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    CHAPTER III. TESTING VOLATILE OILS. Volatile oils are much adulterated, the adulteratious consistiug chiefly in mixing an expensive oil with a cheaper one and with alcohol; more rarely with chloro- form and fat oils. To these adulterations, which have been common for many years, has recently been added the previously mentioned hydrocarbon called terpene or camphene, which is separated in the preparation of concentrated oils. For the recognition of the quality of a volatile oil, serve first of all its physical properties, especially its color, odor and taste. The specific grav^ity varies too much and is not always a sufficient criterion. Reagents can only be employed with a few oils. The chemical detection of adulterations is rendered especially difficult by the fact, that most of the volatile oils form a mixture of terpenes with other combinations, in which the sepa- rate constituent parts do not appear in fixed, but in changeable proportions, and in which the constituents themselves suffer alteration by storing, air and light. Odor and taste are so characteristic for every volatile oil as to suffice in most cases. For testing as to odor, bring a drop of the oil to be examined upon the dry palm of one hand and for some time rub with the other, whereby the odor is more perceptibly brought out. To