TINC

441

mucilage, which has proved successful in healing burns withoutleaving unsightly cicatrices. (Levasseur.)

Tin. See Stannum.

Tincal. Crude Borax. See Sonm Sub-boras.

Tincture. L. E. D. P. Tinctures. Some of which the Codex termsAlcoolata. P. Are solutions of substances, vegetable, animal, oralkaline, in alcohol more or less rectified. Those prepared withhighly-rectified spirit are rarely used, and are decomposed by water.The Codex orders alcohol of different strength, namely, 36°, 32°, and22° of Baume's hydrometer, i. e. spec. grav. -837; "856; and -915.The London College orders all tinctures to be prepared in closedglass vessels, and to be frequently shaken whilst macerating. Thetime of maceration must be determined by the substance. SeeGreen, Hatfield, Wilson, &c.Proper substances for tinctures are such as contain principles that arevery active in small doses; for instance, opium, belladonna, digitalis,elaterium, conium, cinchona, camphor, iodine, and the newly-dis-covered alkalies and resins.Improper substances for tinctures are those which are active only inlarge doses, as the alcohol would in such cases have more power thanthe substance which it held in solution.

Tinctura Absinthii Composita. P. Compound Tincture of Worm-wood. Take §ss eacn 0 f the dried leaves of the great and smallwormwood and of cloves, ^ij of white sugar, and Oss of alcohol;digest for 15 days in a gentle heat, and strain. Dose ^ij to Jss ormore, as a tonic and vermifuge.

Tinctura Acetatis Fehri. E. D. Tincture of Acetate of Iron. Take|ij of acetate of potass, 5j of sulphate of iron, and Oij of rectifiedspirit; triturate the acetate and sulphate into a soft mass, then dryit with a moderate heat, and afterwards rub it up with the spirit;macerate in a well-corked phial for seven days, shaking it occasion-ally ; then pour off the clear liquor.

Decomposition. The sulphuric acid of the sulphate of iron is separatedand goes over to the potass, forming sulphate of potass, while theacetic acid unites with the iron in the form of the protoacetate. Itis a mixed preparation.

Medicinally it is tonic and astringent, and may be given in doses ofH\xx to 5j, in a glassful of water, for indigestion, scrofula, chlorosis,hysteria, &c, twice or thrice a day.

Tinctura Acetatis Ferri cum Alcohole. D. Tincture of Acetateof Iron with Alcohol. Take |j each of sulphate of iron and acetateof potass, and Oij of alcohol, prepared as in the preceding formula,and used in the same doses.