Contractions. - Carb. Ac. Cb.-x.
Present name. - Carbolic Acid. Hc6h5o.
Synonym. - Phenic Acid.
An acid obtained from Coal-tar Oil by fractional distillation and purification.
Characters and Tests. - In colourless acicular crystals, which at a temperature of 95° become an oily liquid, having a strong odour and taste, resembling those of creasote, which it also resembles in many of its characters and properties. Its specific gravity is 1.065; boiling point, 370°. The crystals readily absorb moisture on exposure to the air, and they are thus liquefied; the acid, however, is but slightly soluble in water, but it is freely soluble in alcohol, ether, and glycerine. It does not redden blue litmus paper. A slip of deal dipped into it, and afterwards into Hydrochloric Acid, and then allowed to dry in the air, acquires a greenish-blue colour. It coagulates Albumen. It does not affect the plane of polarization of a ray of polarized light.
Reference to Horn. Proving. - Hale's New Remedies. Vide Brit. Journ. of Horn., vol. xxiii., p. 314, and United States Med. and Surg. Journ., vol. iii., p. 129.
It is most frequently used externally as a lotion, made by solution in water in proportions varying from 1 in 30 to 1 in 400.
Preparation. - Solution in rectified spirit.