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To convert to a parchmentlike substance, esp. by sulphuric acid.

A purple powder precipitated when a sulphuric solution of indigo is diluted with water.

A bath of dilute sulphuric or nitric acid, etc., to remove burnt sand, scale rust, etc., from the surface of castings, or other articles of metal, or to brighten them or improve their color.

d by its resistance to strong chemical reagents. It is used for crucibles, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 194.3. Symbol Pt. Formerly called platina. Platinum black (Chem.), a soft, dull black powder, consisting of…

hydrogen atoms capable of being replaced by basic radicals; -- said of certain acids; as, sulphuric acid is polybasic.

l. -- Leblanc's process (Chem.), the process of manufacturing soda by treating salt with sulphuric acid, reducing the sodium sulphate so formed to sodium sulphide by roasting with charcoal, and converting the sodium sulphide to sodium carbonate by roasting with lime. -- Mesne process. See under Mesne. -- Process mil…

mply an actual or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

A salt of pyrosulphuric acid.

d as a dark amorphous substance by the long-continued boiling of sucrose with very dilute sulphuric acid. It resembles humic acid. [Written also sacculmic.]

The neutral compound formed by the union of an acid base; thus, sulphuric acid and iron form the salt sulphate of iron or green vitriol.

ng), a deep blue liquid used in dyeing, and obtained by dissolving indigo in concentrated sulphuric acid. Brande & C. -- Saxon green (Dyeing), a green color produced by dyeing with yellow upon a ground of Saxon blue.

A white crystalline nitrogenous substance obtained by the action of dilute sulphuric acid on silk gelatin.

Impure dark-colored sulphuric acid that has been used in the refining of petroleum.

cal basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.

or less extent, sulphur plays a part analogous to that of oxygen in an oxyacid; thus, thiosulphuric and sulpharsenic acids are sulphacids; -- called also sulphoacid. See the Note under Acid, n., 2.

ated to, a sulphamide; specifically, designating an amido acid derivative, NH2.SO2.OH, of sulphuric acid (analogous to sulphonic acid) which is not known in the free state, but is known in its salts.

A salt of sulphuric acid.

o, or designating, a sulphonic acid obtained, as a blue solution, by dissolving indigo in sulphuric acid; -- formerly called also cerulic sulphuric acid, but properly called indigo-disulphonic acid.

A hypothetical radical, SO4, regarded as forming the acid or negative constituent of sulphuric acid and the sulphates in electrolytic decomposition; -- so called in accordance with the binary theory of salts. [Written also sulphione.]

A binary compound of sulphion, or one so regarded; thus, sulphuric acid, Hsulphionide.