CHAPTER III.

TESTING VOLATILE OILS.

Extensive adulteration of volatile oils; Testing volatile oils as to odor and taste 66

Recognition of an adulteration with fat oil 67

Detection of alcohol or spirit of wine; Dragendorff's test 68

Hager's tannin test 69

Detection of chloroform; Detection of benzine 71

Quantitative determination of adulterations with alcohol, chloroform, and benzine 72

Detection of adulterations with terpenes or terpene-like fluids 73

Detection of adulterations with volatile oils of a lower quality; Test with iodine 74

Hoppe's nitroprusside of copper test 75

Table showing the behavior of volatile oils free from oxygen towards nitroprusside of copper 76

Hager's alcohol and sulphuric acid test; Hager's guaiacum reaction 78

Division of the volatile oils with reference to the guaiacum reaction 79

Hübl's iodine method 80

A. Kremel's test by titration or saponification with alcoholic potash lye 81

Utilization of Maumené's test by F. R. Williams 82

Planchon's proposed procedure for the recognition of a volatile oil 83