Tinctures are liquid preparations made by the extraction of Drugs with menstrua of Alcohol and Water in various proportions. They are prepared by maceration and filtration or by percolation (the tinctures of iodine and nux vomica are made by simple solution).

In the Eighth Decennial (1905) Revision of the United States Pharmacopoeia a number of the tinctures have been changed in strength to correspond with the tinctures used in other countries. For the following, also, assay processes have been introduced: Aconite, Belladonna Leaves, Cinchona, Colchicum Seed, Hydrastis, Hyoscyamus, Iodine, Nux Vomica, Opium, Deodorized Opium, Physostigma, and Stramonium.

Tinctrurae Herbarum Recentium. - Tinctures of Fresh Herbs, or "Green Tinctures," similar to the Homoeopathic or so-called "German Tinctures," also to the specific tinctures of the Eclectics, when not otherwise directed are to be prepared by the following general formula:

Take of the fresh herb, cut, bruised, or crushed, 50 Gm.; macerate for fourteen days in Alcohol 100 Cc.; express the liquid and filter.