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A hydrous sulphate of lead and copper occurring in bright blue monoclinic crystals.

talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75. Magnesium sulphate. (Chem.) Same as Epsom salts.

To impregnate (wood) with a preservative solution of copper sulphate (often called Mar"ga*ry's flu"id [-riz]).

Native sulphate of ammonia, found in volcanic districts; -- so named from Mascagni, who discovered it.

and the first discovered of the so-called coal- tar, or aniline, dyes. It consists of the sulphate of mauveïne, and is a dark brown or bronze amorphous powder, which dissolves to a beatiful purple color. Called also aniline purple, violine, etc.

A hydrous sulphate of iron of a green color and vitreous luster; iron vitriol.

A whitish soluble powder used as a developer in photography. Chemically, it is the sulphate of methyl-p-amino-m-cresol.

Native sodium sulphate; Glauber's salt.

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

A basic sulphate of iron; -- so named from Monsel, a Frenchman.

duced by touching with a pointed zinc rod a silver plate on which is a solution of copper sulphate.

A salt of an oxyacid, as a sulphate.

g timber and rendering it incombustible by impregnating it successively with solutions of sulphate of iron and calcium chloride in vacuo. --Payn"ize, v. t.

d in distinction from the contractor's temporary way. -- Permanent white (Chem.), barium sulphate (heavy spar), used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide.

[So called because originally brought from a suburb of Paris.] (Chem.) Anhydrous calcium sulphate, or calcined gypsum, which forms with water a paste which soon sets or hardens, and is used for casts, moldings, etc. The term is loosely applied to any plaster stone or species of gypsum. -- Plaster of Paris bandage (Su…

any uses, or that cures many diseases. [Obs.] Polychrest salt (Old Med. Chem.), potassium sulphate, specifically obtained by fusing niter with sulphur.

brous masses, of a brick-red color, being tinged with iron, and consisting chiefly of the sulphates of lime, magnesia, and soda.

An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium).

heated slag which has been previously saturated with a solution of some metallic salt, as sulphate of copper. -- Final process (Practice), a writ of execution in an action at law. Burrill. -- In process, in the condition of advance, accomplishment, transaction, or the like; begun, and not completed. -- Jury process…

or designating, an acid called also disulphuric acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H2S2O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.