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Oil of Bergamot (OL Bergamottae), Light green ^); = 0,882 
to 0,886 2); neutral reaction^); miscible in every proportion with Spiritus 
fortior; evaporation-residue not above 6 per cent. 
1) It is not correct to require simply a green bergamot oil, as pure bergamot 
oil in the fresh state has a brown-yellow or honey-like colour, and the green colour 
frequently originates only from a content of copper gradually absorbed by the oil 
through long storage in the estagnons. Compare our Report, April 1889, 16. 
^) We have had before us on various occasions oils whose specific gravity was 
but little above 0,881, and therefore recommend as a limit for dj^o : 0,881 to 6,886. 
^) Almost all bergamot oils show a minute content of free acid; the same 
applies to the other oils mentioned here. 
^) Per contra, the residue on evaporation should not be below 5 per cent., 
as this would point to an adulteration with oil of turpentine, oil of sweet oranges, 
or a similar oil. 
An ester value would also be advisable; the lowest content of linalyl acetate 
should be 30 per cent. 
Oil of Caraway (01, carvi). Colourless or light yellow; d.^^o = 
0,905 to 0,915; neutral reaction; makes a clear solution in an equal 
volume of Spiritus fortior, and the solution must not be coloured violet 
by a drop of ferric chloride solution. 
For the further test of caraway oil a determination of the rotatory power would 
be advisable; normal oil shows a dextrorotation of 70° to 80°. 
Oil of Cherry laurel {OL Laurocerasi). Colourless or light 
yellow; d^50 = 1,054 to 1,066; weak acid reaction; soluble in 300 
parts water, in 2 vol. Spir. dilut., in every proportion in ether; when 
shaken with double the volume concentrated solution of sodium bisul- 
phite, a solid crystalline mass should be formed; it is further tested 
in the usual manner for artificial chlorinated benzaldehyde and for 
nitrobenzene. 
^) We recommend a lowest limit of 1,050. 
Oil of Juniper berries [OL Juniperi). Colourless or light yellow; 
d^50 = 0,860 to 0,900; neutral reaction; oil of juniper berries should - 
make a clear solution with 10 parts Spiritus fortior i). 
^) Generally, only oils which are quite freshly distilled answer this test. 
Oil of Myrtle, rectified [OL Myrti rectificatum). Colourless; 
d^50 = 0,88 to 0,89; boiling point 160° to 170°^); neutral reaction; 
soluble in every proportion in Spiritus fortior. 
^) It will be seen from the specific gravity and the boiling point that it is 
here not a question of myrtle oil, whose specific gravity lies between 0,890 and 
0,915, but of a myrtle oil fraction. 
Oil of Origanum [01. Origani)^). Light yellow; d^go = 0,870 
to 0,910; neutral reaction; completely soluble in Spiritus fortior. 
^) It is difficult to explain why this oil , which in practice is used only in 
extremely rare cases, has been included. Was it perhaps intended to be oil of 
Cretian origanum [01. Origani cretici)} 
