Eucalyptus Macarthuri Oil

#### Eucalyptus Macarthuri. Among the comparatively few eucalyptus oils which have found use exclusively in perfumery, we find the steam distilled oil from the leaves of **Eucalyptus Macarthuri**, a native of southeastern Australia. The tree is cultivated in that area, and was introduced in the 1950's into the Iswete and east Transvaal provinces of the Union of South Africa. Earlier, it had been introduced into Brazil and Belgian Congo where the oil was experimentally distilled in the 1940's. The yield of essential oil from these leaves is very small, usually far less than one percent. This fact, among others, is responsible for the farmer's reluctance and failing interest in the distillation of this oil. Oil of **Eucalyptus**** ****Macarthuri **is a yellowish to pale orange colored oil with an intensely fresh, fruity-rosy initial odor, sweet-rosy and fruity- woody body notes and a pleasant, sweet, faint-woody dryout. There is considerable difference in odor characteristics between a crude (natural) oil, and a rectified oil. Like many other eucalyptus oils, the **Macarthuri **oil too contains lower aliphatic aldehydes in the "foreruns" of the redistillation. The foreruns are usually removed prior to use of the oil in perfumery. A rectified oil may contain as much as 70 to 80% natural geranyl acetate. The main constituent being such a well-known perfume "chemical", oil of **Eucalyptus**** ****Macarthuri**** **has nothing in particular to offer the perfumer beyond the fact that it is Nature's best source of natural geranyl acetate. Instrumental investigations of essential oils of recent years have also affected this oil. There are alcohols other than geraniol in this oil, too. Pure geraniol (i.e. unaccompanied by other "rose" alcohols) seems to be extremely rare in steam distilled essential oils. Still produced, although on a limited scale only, the oil of **Eucalyptus**** ****Macarthuri**** **may slowly disappear from the market.