Copper sulfphate

 Bluestone, or Sulphate of Copper

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.