alizarin

alizarin
/euh liz"euhr in/, n. Chem.
a solid appearing reddish-orange as crystals and brownish-yellow as powder, C14H8O4, one of the earliest known dyes, formerly obtained in its natural state from madder and now derived from anthraquinone: used chiefly in the synthesis of other dyes.
Also, alizarine /euh liz"euhr in, -euh reen'/.
[1825-35; < F alizarine, equiv. to alizar(i) ( < Sp < Ar al the + 'asarah juice) + -ine -INE1]

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also spelled  Alizarine,  

      a red dye originally obtained from the root of the common madder plant, Rubia tinctorum, in which it occurs combined with the sugars xylose and glucose. The cultivation of madder and the use of its ground root for dyeing by the complicated Turkey red process were known in ancient India, Persia, and Egypt; the use spread to Asia Minor about the 10th century and was introduced into Europe in the 13th.

      Laboratory methods of preparing alizarin from anthraquinone were discovered in 1868, and, upon commercial introduction of the synthetic dye in 1871, the natural product disappeared from the market for textile dyes, though natural rose madder is still occasionally used, as a lake, for artists' colours. The application of alizarin to cotton, wool, or silk requires prior impregnation of the fibre with a metal oxide, or mordant. The shade produced depends on the metal present: aluminum yields a red; iron, a violet; and chromium, a brownish red.

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Universalium. 2010.

Look at other dictionaries:

  • Alizarin [2] — Alizarin in der Druckerei und Färberei, das in teigförmigem Zustand in den Handel kommende Anthracenderivat, hatte zunächst das Pernodsche Krappextrakt in den seinen Lila , namentlich aber Rot und Rosamustern des baumwollenen Hemden , Brillantin… …   Lexikon der gesamten Technik

  • Alizarin [1] — Alizarin (Dioxyanthrachinon, Lizarinsäure, Krapprot) C14H8O4 oder Natürlich gebildet findet sich das Alizarin nur in alter Krappwurzel (Rubiatinctorium), in der frischen Wurzel ist es nicht fertig gebildet. Diese letztere enthält nur ein Glykosid …   Lexikon der gesamten Technik

  • alizarin — carmine; n. an orange red dye derived from coal tar and originally isolated from the plant madder (Rubia tinctorum). Alizarin is insoluble in water but dissolves in alkalis, alcohol, and ether. It is used as a pH indicator and as a histochemical… …   The new mediacal dictionary

  • Alizarin — A*liz a*rin, Alizarine A*liz a*rine, n. [F. alizarine, fr. alizari.] (Chem.) A coloring principle, {C14H6O2(OH)2}, found in madder, and now produced artificially as an an orange red crystalline compound from anthracene. It is used in making red… …   The Collaborative International Dictionary of English

  • Alizărin — (Alizzari, Krapproth, Lizarinsäure), C20H6O6 + 4aq., Farbestoff der Krappwurzel, von Robiquet u. Colin entdeckte, dem Musivgold ähnliche gelbe Blättchen, od. rothe, durchsichtige, seidenglänzende Nadeln bildend, wenig in Wasser, leicht in Alkohol …   Pierer's Universal-Lexikon

  • Alizarīn — (von Alizari, einer Sorte Krapp, Krapprot) C14H8O4 oder C6H4.CO.CO.C6H2(OH)2, Farbstoff, findet sich im Krapp als Zersetzungsprodukt der in der frischen Wurzel enthaltenen Ruberythrinsäure, die durch Fermente in A. und Zucker gespalten wird. A.… …   Meyers Großes Konversations-Lexikon

  • Alizarin — Alizarīn, Krapprot, der Farbstoff der Krappwurzel, Dioxyanthrachinon, durchsichtige, orangerote, prismatische Kristalle, in kaltem Wasser fast unlöslich, leicht löslich in Alkohol und Äther, mit Alkalien schöne violette, mit alkalischen Erden und …   Kleines Konversations-Lexikon

  • alizarin — [ə liz′ərin, ə liz′ərēnə liz′ə rin] n. [Ger < Fr & Sp alizari, dried madder root < Ar al ʿ uṣāra, the juice < ʿ aṣara, to press] a reddish yellow crystalline compound, C6H4 (CO) 2C6H2 (OH) 2, produced by oxidizing anthracene and used in… …   English World dictionary

  • Alizarin — Madder lake redirects here. For the Australian band, see Madder Lake (band). Alizarin …   Wikipedia

  • Alizarin — Strukturformel Allgemeines Name Alizarin Andere Namen …   Deutsch Wikipedia

  • alizarin — 1,2 Dihydroxyanthraquinone; a red dye that occurs in the root of madder (Rubia tinctorum and other Rubiaceae) in glucose combination (ruberythric acid) as orange needles, slightly soluble in water; used by the ancients as a dye. Now made… …   Medical dictionary

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