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Colcothar, kol′kō-thar, n. a dark-red iron peroxide formed by calcining copperas.

The solution of iron in spirit of vitriol produces green copperas; which being calcined, becomes a red substance, called colcothar.

Ferric oxide is known as colcothar, English-Roth, rouge, crocus, etc.

Take two Ounces of Vinegar, a Dram of Colcothar, two Drams of Crocus Martis Astringens; beat the whole together, steeping Muscus Quercinus therein; then throw upon it the Powder of Mushrooms, or of Crepitus Lupi: Apply this Remedy, and you'll soon stop the H�morrhage, taking Care nevertheless to bind the Part well, otherwise the Astringents do not readily take Effect.

Take Colcothar or Red Vitriol that remains in the Retort after the Spirit has been drawn off, Burnt Allom, and Sugar-candy, of each thirty Grains; the Urine of a Young Person, and Rose-Water, of each half an Ounce; and two Ounces of Plantain-Water: Let the whole Mixture be stirr'd about for a long time, and then put into a Vial.