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on. Black alkali is so called because water containing it dissolves humus, forming a dark-colored solution which, when it collects in puddles and evaporates, produces characteristic black spots.

dyeing matter extracted from the roots of Alkanna tinctoria, which gives a fine deep red color.

A silicate containing a large amount of cerium. It is usually black in color, opaque, and is related to epidote in form and composition.

A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.

Changeable in color.

Changing color.

An oxidation product of uric acid. It is of a pale reddish color, readily soluble in water or alcohol.

vity of about 2.6. Atomic weight 27.08. Symbol Al. Aluminium bronze or gold, a pale gold- colored alloy of aluminium and copper, used for journal bearings, etc.

Of a pale brown color; leather-yellow. Brande.

A color inclining to purple.

Of a purplish color. Buchanan.

An instrument of horn used for collecting painters' colors on the stone in the process of grinding.

A variety of feldspar, having a verdigris-green color.

Amber color, or anything amber-colored; a clear light yellow; as, the amber of the sky.

whale (Physeter macrocephalus), which is believed to be in all cases its true origin. In color it is white, ash-gray, yellow, or black, and often variegated like marble. The floating masses are sometimes from sixty to two hundred and twenty-five pounds in weight. It is wholly volatilized as a white vapor at 212º Fahre…

A variety of crystallized quartz, of a purple or bluish violet color, of different shades. It is much used as a jeweler's stone. Oriental amethyst, the violet-blue variety of transparent crystallized corundum or sapphire.

Resembling amethyst, especially in color; bluish violet.

A colorless liquid prepared from herring brine and containing amines, used as a local antiseptic.

A dry kind of cherry, of a light color. Simmonds.

A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some comm…