【化】 铜蓝

Indigo \In"di*go\, a.
Having the color of, pertaining to, or derived from, indigo.

{Indigo berry} (Bot.), the fruit of the West Indian shrub
{Randia aculeata}, used as a blue dye.

{Indigo bird} (Zo["o]l.), a small North American finch
({Cyanospiza cyanea}). The male is indigo blue in color.
Called also {indigo bunting}.

{Indigo blue}.
(a) The essential coloring material of commercial indigo,
from which it is obtained as a dark blue earthy powder,
with a reddish luster, {C16H10N2O2}, which may be
crystallized by sublimation. Indigo blue is also made
from artificial amido cinnamic acid, and from artificial
isatine; and these methods are of great commercial
importance. Called also {indigotin}.
(b) A dark, dull blue color like the indigo of commerce.

{Indigo brown} (Chem.), a brown resinous substance found in
crude indigo.

{Indigo copper} (Min.), covellite.

{Indigo green}, a green obtained from indigo.

{Indigo plant} (Bot.), a leguminous plant of several species
(genus {Indigofera}), from which indigo is prepared. The
different varieties are natives of Asia, Africa, and
America. Several species are cultivated, of which the most
important are the {Indigofera tinctoria}, or {common
indigo plant}, the {Indigofera Anil}, a larger species,
and the {Indigofera disperma}.

{Indigo purple}, a purple obtained from indigo.

{Indigo red}, a dyestuff, isomeric with indigo blue, obtained
from crude indigo as a dark brown amorphous powder.

{Indigo snake} (Zo["o]l.), the gopher snake.

{Indigo white}, a white crystalline powder obtained by
reduction from indigo blue, and by oxidation easily
changed back to it; -- called also {indigogen}.

{Indigo yellow}, a substance obtained from indigo.


Copper \Cop"per\, n. [OE. coper (cf. D. koper, Sw. koppar, Dan.
kobber, G. kupfer), LL. cuper, fr. L. cuprum for earlier
Cyprium, Cyprium aes, i.e., Cyprian brass, fr. Gr. ? of
Cyprus (Gr. ?), anciently renowned for its copper mines. Cf.
{Cypreous}.]
1. A common metal of a reddish color, both ductile and
malleable, and very tenacious. It is one of the best
conductors of heat and electricity. Symbol Cu. Atomic
weight 63.3. It is one of the most useful metals in
itself, and also in its alloys, brass and bronze.

Note: Copper is the only metal which occurs native abundantly
in large masses; it is found also in various ores, of
which the most important are chalcopyrite, chalcocite,
cuprite, and malachite. Copper mixed with tin forms
bell metal; with a smaller proportion, bronze; and with
zinc, it forms brass, pinchbeck, and other alloys.

2. A coin made of copper; a penny, cent, or other minor coin
of copper. [Colloq.]

My friends filled my pockets with coppers.
--Franklin.

3. A vessel, especially a large boiler, made of copper.

4. pl. Specifically (Naut.), the boilers in the galley for
cooking; as, a ship's coppers.

Note: Copper is often used adjectively, commonly in the sense
of made or consisting of copper, or resembling copper;
as, a copper boiler, tube, etc.

All in a hot and copper sky. --Coleridge.

Note: It is sometimes written in combination; as,
copperplate, coppersmith, copper-colored.

{Copper finch}. (Zo["o]l.) See {Chaffinch}.

{Copper glance}, or {Vitreous copper}. (Min.) See
{Chalcocite}.

{Indigo copper}. (Min.) See {Covelline}.

Covelline \Co*vel"line\ (k?-v?l"l?n), Covellite \Co*vel"lite\
(-l?t), n. [After Covelli, the discoverer.] (Min.)
A native sulphide of copper, occuring in masses of a dark
blue color; -- hence called {indigo copper}.