FERRI SULPHAS—FERROUS SULPHATE—COPPERAS—GREEN VITRIOL
Derivation.—Iron wire is dissolved by boiling in dilute sulphuric acid.
Properties.—Large, pale bluish-green, monoclinic prisms, without odor and having a saline styptic taste; efflorescent in dry air. On exposure to moist air the crystals rapidly absorb oxygen and become coated with brownish-yellow, basic ferric sulphate; soluble in water, insoluble in alcohol.
Dose.—Same as reduced iron.
FERRI SULPHAS EXSICCATUS—DRIED FERROUS SULPHATE
Derivation.—Allow ferrous sulphate, 100 parts, to effloresce at a temperature of 104° F., then heat on a water bath until the product weighs 65.
Properties.—A greyish-white powder, slowly but completely soluble in water, without odor, and having a saline styptic taste.
Dose.—Same as reduced iron.