Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.
|
COCHINEAL
, a natural dye-stuff used for the See also:production of See also:scarlet, See also:crimson, See also:orange and other tints, and for the preparation of See also:lake and See also:carmine
.
It consists of the See also:females of Coccus cacti, an See also:insect of the See also:family Coccidae of the See also:order See also:Hemiptera, which feeds upon various See also:species of the Cactaceae, more especially the nopal plant, See also:Opuntia coccinellifera, a native of See also:Mexico and See also:Peru
.
The dye was introduced into See also:Europe from Mexico, where it had been in use See also:long before the entrance of the Spaniards in the See also:year 1518, and where it formed one of the See also:staple tributes to the See also:crown for certain districts
.
In 1523 See also:Cortes received instructions from the See also:Spanish See also:court to procure it in as large quantities as possible
.
It appears not to have been known in See also:Italy so See also:late as the year 1548, though the See also:art of See also:dyeing then flourished there
.
See also:Cornelius See also:van Drebbel, at See also:Alkmaar, first employed cochineal for the production of scarlet in 1650
.
Until about 1725 the belief was very prevalent that cochineal was the See also:seed of a plant, but Dr See also: It is collected thrice in the seven months of the See also:season . The See also:insects are carefully brushed from the branches of the See also:cactus into bags, and are then killed by See also:immersion in hot See also:water, or by exposure to the See also:sun, See also:steam, or the See also:heat of an See also:oven—much of the variety of See also:appearance in the commercial See also:article being caused by the mode of treatment . The dried insect has the See also:form of irregular, fluted and See also:concave grains, of which about 70,000 go to a See also:pound . Cochineal has a musty and bitterish See also:taste . There are two See also:principal varieties—See also:silver cochineal, which has a greyish-red colour, and the furrows of the body covered with a white See also:bloom or See also:fine down; and See also:black cochineal, which is of a dark reddish brown, and destitute of bloom . Granilla is an inferior kind, gathered from uncultivated See also:plants . The best See also:crop is the first of the season, which consists of the unimpregnated females; the later crops contain an admixture of See also:young insects and skins, which contain proportionally little colouring See also:matter . The black variety of cochineal is sometimes sold for silver cochineal by shaking it with powdered See also:talc or heavy-spar; but these adulterations can be readily detected by means of a See also:lens . The See also:duty in the See also:United See also:Kingdom on imported cochineal was repealed in 1845 . Cochineal owes its tinctorial See also:power to the presence of a sub-stance termed cochinealin or carminic See also:acid, C17H1801o, which may be prepared from the aqueous decoction of cochineal . |
|
|
[back] DENYS MARIE PIERRE AUGUSTIN COCHIN (1851L'Evolution... |
[next] JOHANN COCHLAEUS (1479-1552) |
There are no comments yet for this article.
Do not copy, download, transfer, or otherwise replicate the site content in whole or in part.
Links to articles and home page are encouraged.