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Common potash mica. See Mica.

having a greasy luster, as the variety elæolite. It is a silicate of aluminia, soda, and potash.

Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

calcium oxalate. It is prepared on a large scale, by the action of fused caustic soda or potash on sawdust, as a white crystalline substance, which has a strong acid taste, and is poisonous in large doses. It is used in dyeing, calico printing, bleaching flax and straw, the preparation of formic acid, and in salts of…

A kind of mica related to muscovite, but containing soda instead of potash. It is characteristic of the paragonite schist of the Alps.

red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See Mica.

Glassmaker's ashes; a kind of potash or pearlash, brought from the Levant and Syria, -- used in the manufacture of fine glass.

Potassium hydroxide, commonly called caustic potash.

pery luster, obtained by adding a solution of potassium ferrocyanide (yellow prussiate of potash) to a ferric salt. It is used in dyeing, in ink, etc. Called also Williamson's blue, insoluble Prussian blue, Berlin blue, etc. -- Prussian carp (Zoöl.) See Gibel. -- Prussian green. (Chem.) Same as Berlin green, under Be…

A salt of prussic acid; a cyanide. Red prussiate of potash. See Potassium ferricyanide, under Ferricyanide. Yellow prussiate of potash. See Potassium ferrocyanide, under Ferrocyanide.

ich phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.

ol series, obtained by melting certain resins, as galbanum, asafetida, etc., with caustic potash. It is also produced artificially and used in making certain dyestuffs, as phthaleïn, fluoresceïn, and eosin.

icaceous mineral occurring in minute scales. It is essentially a silicate of aluminia and potash containing vanadium.

A crude potash obtained from beet-root residues and other similar sources. [Written also salin.]

pared from the ink, or black secretion, of the sepia, or cuttlefish. Treated with caustic potash, it has a rich brown color; and this mixed with a red forms Roman sepia. Cf. India ink, under India. Sepia drawing or picture, a drawing in monochrome, made in sepia alone, or in sepia with other brown pigments.…

ent or coloring material used in various arts. It is a vitreous substance made of cobalt, potash, and calcined quartz fused, and reduced to a powder.

A peculiar substance obtained from the wool of sheep, consisting largely of potash mixed with fatty and earthy matters. It is used as a source of potash and also for the manufacture of gas.

A caustic application made up of equal parts of caustic potash and quicklime; -- called also Vienna caustic.

sulphate, or subjected to the action of sulphuric acid or of a sulphate; as, vitriolated potash, i. e., potassium sulphate.

nd is often confounded with smalt, from which, however, it is distinct, as it contains no potash. The name is often loosely applied to mixtures of zaffer proper with silica, or oxides of iron, manganese, etc. [Written also zaffre, and formerly zaffree, zaffar, zaffir.]