Tinctura Cinchonæ Ammoniata. L. In this preparation we have the tonic powers of the bark combined with the stimulus of the Ammonia. Dose, fʒss to fʒij. Acids and Acidulous Salts are of course incompatible with it.
Tinctura Guaiaci. L.E.D. A simple solution of guaiac. Dose, fʒi-fʒiij.
Tinctura Guaiaci Ammoniata. This is a solution of the guaiac in the aromatic spirit of ammonia, and is consequently more stimulating than the preceding one, and more efficacious as a sudorific: after arterial action is properly reduced, it is certainly one of our best remedies in rheumatism. Dose, fʒj to fʒij, at bed time, and its effects should be promoted by some warm beverage. It is worthy of remark, that nitrous acid and the spirit of nitric æther occasion an extraordinary decomposition of these tinctures, separating the guaiacum into coagulated masses, and imparting to the whole an intense bluish green colour. I find that chlorine has the same effect;[[686]] but the sulphuric and muriatic acids produce no disturbance, although all acids and acidulous salts must be considered as incompatible with it. If equal parts of quick-lime and powdered guaiacum be rubbed together, and a quantity of water be poured over them, and the mixture be allowed to stand until it becomes fine, we shall obtain a solution of this substance, which will mix in any proportion with aqueous vehicles without decomposition, and to which the aromatic spirit of ammonia may be subsequently added with effect.
Tinctura Toluiferæ Balsami. E.D. This is only useful as an adjunct, to impart agreeable flavour and fragrance to other remedies.
The above tinctures, when added to water, are instantly decomposed, the practitioner must therefore remember that when he prescribes them in aqueous vehicles, it will be necessary to direct them to be triturated with some viscid liquor, as mucilage, previous to the addition of the water, in order to suspend the resinous precipitate.
2. Tinctures prepared with Spirit above Proof.
Tinctura Aloes Composita. L.D. Elixir Proprietatis. P.L. 1720. Tincture of Myrrh is the menstruum of the Aloes in this preparation, to which Saffron is added. Dose, fʒj to fʒij. Form. 16, 97.
Tinctura Myrrhæ. L. The strength of the spirituous solvent has been very judiciously increased in the Editio Altera of the London Pharmacopœia, by which means a brighter tincture is obtained. It is rarely used except in astringent and detergent gargles, or as an external application to foul ulcers; diluted with water it presents us with an excellent lotion for spongy gums.[[687]]
3. Tinctures prepared with Proof Spirit.
Tinctura Angusturæ. D. See Cuspariæ Cortex.