A practical treatise on the manufacture of perfumery

by C. Deite

2. The oil at a temperature of over 32° F. contains a crystalline stearoptene.

a. The oil is laevorotatory, the stearoptene melts at 77° F., and, on adding sulphuric acid, a clear solution remains behind: Rose oil.

b. The oil possesses no rotatory power, the stearoptene melts at 50° F., and, on adding sulphuric acid, two layers are formed, only one of which is liquid: Anise-seed oil.

c. The oil is dextrorotatory, the stearoptene melts at 41° F., and, on adding sulphuric acid, a nearly colorless fluid remains behind: Fennel oil.

3. The oil is perfectly fluid and clear at above 32° F.

I. The oil explodes with iodine, emitting violet vapors.

a. The oil thickens in the air and readily forms resin.

It requires for its solution several volumes of alcohol: Oil of conifers.

b. The oil, on exposure to the air, does not thicken and but slowly forms resin.

α. It is dextrorotatory.