These are remedies used to destroy the vitality of a part. They comprise lunar caustic, bluestone, and solution of chloride of zinc.
779. Bluestone, or Sulphate of Copper, is used in a solution of from four to fifteen grains to the ounce of water, and applied to foul and indolent ulcers, by means of rag dipped in it. It is rubbed in substance on fungous growths, warts, &c., to destroy them. Caution.--It is a poison.
780. Lunar Caustic, or Nitrate of Silver, is an excellent remedy in erysipelas when applied in solution (one drachm of the salt to one ounce of water), which should be brushed all over the inflamed part, and for an inch beyond it. This blackens the skin, but it soon peels off. To destroy warts, proud flesh, and unhealthy edges of ulcers, &c., it is invaluable; and as an application to bed sores, pencilled over with a solution of the same strength, and in the same manner as for erysipelas. Caution.--It is a poison.
781. Solution of Chloride of Zinc, more commonly known as Sir William Burnett's "Disinfecting Fluid," is a valuable escharotic in destroying the parts of poisoned wounds, such as the bite of a mad dog. It is also very useful in restoring the hair after the scalp has been attacked with ringworm; but its use requires extreme caution, as it is a powerful escharotic. In itch, diluted (one part to thirty-two) with water, it appears to answer very well. Caution.--It is a most powerful poison.