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Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.

Like ink; suitable for making ink. Sulphate of iron (copperas, green vitriol) is called atramentarious, as being used in making ink.

A mineral consisting principally of sulphate of iron; white copperas; -- so called because found in the province of Coquimbo, Chili.

very extensively used in the preparation of inks, dyes, mordants, etc. (b) (Min.) Same as copperas, melanterite and sulphate of iron. -- Green ware, articles of pottery molded and shaped, but not yet baked. -- Green woodpecker (Zoöl.), a common European woodpecker (Picus viridis); -- called also yaffle.…

An impure yellow sulphate of iron; yellow copperas or copiapite.

Any substance, as alum or copperas, which, having a twofold attraction for organic fibers and coloring matter, serves as a bond of union, and thus gives fixity to, or bites in, the dyes.

r Sulphuric. [Colloq.] Blue vitriol. See under Blue. -- Green vitriol, ferrous sulphate; copperas. See under Green. -- Oil of vitriol, sulphuric or vitriolic acid; -- popularly so called because it has the consistency of oil. -- Red vitriol, a native sulphate of cobalt. -- Vitriol of Mars, ferric sulphate, a white…

llow-hammer. -- Yellow cat (Zoöl.), a yellow catfish; especially, the bashaw. -- Yellow copperas (Min.), a hydrous sulphate of iron; -- called also copiapite. -- Yellow copper ore, a sulphide of copper and iron; copper pyrites. See Chalcopyrite. -- Yellow cress (Bot.), a yellow-flowered, cruciferous plant (Barbarea…