Grade designation | Specific gravity at 270/270C | Optical rotation | Refractive index at 270C** | ACID VALUE MAXIMUM (using 2 to 2.5grams of the sample) | Saponification value (using 4 to 5 grams of the sample) | Saponification value after acetylation | Total Alcohol AS Vetiver C15 H24 O), percent by weight Minimum | Carbonyl Value (C15 H22O), per cent by weight minimum | Solubility in 80% (by volume) Ethyl alcohol |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Grade-I | 0.992 to 1.034 | -500to -1300 | 1.5132 to 1.5242 | 40 | 25 to 80 | 145 to 200 | 70 | 24 | One to two volumes |
Description and appearance
Oil of Vetiver (khus) shall be obtained by steam hydro-distillation of clean and fresh or air dry roots of Vetiveria zizaniodes (Linn) Nash, family Gramineae growing wild.
The oil shall be clear and free from sediment, suspended matter, separated water and adulterants.
It shall have characteristic aroma and persistent odour of Khus roots and shall be light brown to deep brown, sometimes greenish in colour.