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See also:GROUP IV . Hydrates or Hydroxides.—Several native earths
belong here, notably yellow ochre, raw See also:umber, raw sienna and Cappagh See also:- BROWN
- BROWN, CHARLES BROCKDEN (1771-181o)
- BROWN, FORD MADOX (1821-1893)
- BROWN, FRANCIS (1849- )
- BROWN, GEORGE (1818-188o)
- BROWN, HENRY KIRKE (1814-1886)
- BROWN, JACOB (1775–1828)
- BROWN, JOHN (1715–1766)
- BROWN, JOHN (1722-1787)
- BROWN, JOHN (1735–1788)
- BROWN, JOHN (1784–1858)
- BROWN, JOHN (1800-1859)
- BROWN, JOHN (1810—1882)
- BROWN, JOHN GEORGE (1831— )
- BROWN, ROBERT (1773-1858)
- BROWN, SAMUEL MORISON (1817—1856)
- BROWN, SIR GEORGE (1790-1865)
- BROWN, SIR JOHN (1816-1896)
- BROWN, SIR WILLIAM, BART
- BROWN, THOMAS (1663-1704)
- BROWN, THOMAS (1778-1820)
- BROWN, THOMAS EDWARD (1830-1897)
- BROWN, WILLIAM LAURENCE (1755–1830)
brown. These substances owe their See also:colours mainly to hydrates and oxides of See also:iron and of See also:manganese, but the presence of a colourless See also:body such as See also:- WHITE
- WHITE, ANDREW DICKSON (1832– )
- WHITE, GILBERT (1720–1793)
- WHITE, HENRY KIRKE (1785-1806)
- WHITE, HUGH LAWSON (1773-1840)
- WHITE, JOSEPH BLANCO (1775-1841)
- WHITE, RICHARD GRANT (1822-1885)
- WHITE, ROBERT (1645-1704)
- WHITE, SIR GEORGE STUART (1835– )
- WHITE, SIR THOMAS (1492-1567)
- WHITE, SIR WILLIAM ARTHUR (1824--1891)
- WHITE, SIR WILLIAM HENRY (1845– )
- WHITE, THOMAS (1628-1698)
- WHITE, THOMAS (c. 1550-1624)
white See also:clay or See also:barium sulphate is usual with the paler See also:pigments. A false yellow ochre from See also:Cyprus is really a basic ferric sulphate, and does not properly belong to this
group. Besides the yellow and brown pigments, there is a magnificent deep See also:green pigment in this group, known as See also:emerald See also:oxide of See also:chromium or viridian. The See also:blue See also:copper preparation which goes under the name of bleu lumiere and See also:mountain blue, a very unstable pigment, is also essentially a See also:hydrate, though by no means pure. It should be stated that all the earthy or native hydrates belonging to this group contain See also:water in two states, namely, hygroscopic or loosely-attached and constitutional. Before grinding them in oil, the reduction in the amount of the hygroscopic moisture by means of a current of dry See also:air or a See also:gentle warmth often improves the See also:hue and working quality of these pigments.
End of Article: GROUP IV
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