Potassium permanganate easily dissolves in distilled water and forms a beautiful violet solution, a few drops of which are placed in a glass of water for use. This salt is one of the most valuable articles for the teeth; it has the property of readily giving off oxygen to organic substances and hence immediately destroys all odor in the mouth by oxidizing the organic bodies; it also removes at once the odor of tobacco smoke. After rinsing the mouth with this solution, it is well to use some peppermint water for polishing the teeth. This mouth wash leaves brown stains on linen and other materials as well as on the skin; such spots can only be removed with acids (hydrochloric, oxalic, etc.). SALICYLATED TOOTH TINCTURE. Salicylic acid 1¾ oz. Orange-flower water 30 grains. Water 2 qts. Alcohol 1 qt. Oil of peppermint 30 grains. Salicylic acid is a substance possessing strong antiseptic properties; therefore, when this mouth wash is used after meals, the occurrence of any bad odor, even in persons with defective teeth, is prevented and the progress of caries is arrested, so that the acid may be considered one of the most valuable substances in hygienic perfumery. Dissolve the salicylic acid in the warm alcohol mixed with water; add to the still warm solution the orange-flower water and the oil of peppermint dissolved in some of the alcohol. EAU DE SALVIA. Oil of lemon. ¾ oz. Oil of sage 1¾ oz. Alcohol 1 qt. Water 4 qts. The essential oils are dissolved in the alcohol, and this solution mixed with the water. EAU DE VIOLETTES. Tincture of orris root 1 qt. Rose water, triple 1 qt. Alcohol 1 qt. Oil of bitter almond 75 grains. Oil of neroli 30 grains. CHAPTER XXV. COSMETIC PERFUMERY. In cosmetic perfumery, use is made chiefly of articles which serve to beautify some parts of the body by artificial means; for instance, to impart to pale cheeks a youthful freshness or to restore to prematurely gray hair its original appearance. In so far as the former object is attained also by the preparations discussed in Chapters XXI., XXII., XXIII., and XXIV., they likewise belong to the domain of cosmetic perfumery; for health and beauty are inseparably connected. Though we have separated hygienic from cosmetic perfumery, we have done so only in order to draw the line between preparations whose regular use really improves the bodily health, and those which temporarily cover a defect of certain parts of the body. Cosmetics may also be divided into several groups—those for beautifying the skin, as paints and toilet powders; and those for the care of the hair. The latter are subdivided into hair washes, hair dyes, so-called hair tonics, depilatories, and preparations for dressing the hair, _i.e._, for making it glossy and fixing it. CHAPTER XXVI. SKIN COSMETICS AND FACE LOTIONS.