The oil is rendered but slightly turbid by sulphuric acid; it acquires a red-violet color by nitric acid, has no effect upon the plane of polarization, and has a peculiar odor: Oil of valerian.
b. The oil is neutral.
α. It dissolves with difficulty in alcohol.
β. The oil is miscible in every proportion with alcohol.
1. It is dextrorotatory.
The oil is colorless or yellowish, it thickens on exposure to the air, and dissolves and reduces fuchsine: Caraway oil.
The oil is thick, yellow-brown or red-yellow, and has a peculiar odor: Calamus oil.
2. The oil is laevorotatory.
It is fluid and has an aromatic odor: Rosemary oil.