| 单词 | congo red |
| 释义 | > as lemmasCongo red Congo red n. a red dye originally used to colour cotton without the use of a mordant, and now chiefly used as a tissue stain in microscopy.Congo red is an azo compound derived from benzidine, and can be used as a pH indicator as it turns blue in acid conditions. [After German Kongorot (1885), probably so called as a marketing strategy to evoke romantic associations with Africa (a popular subject at the time due to the Berlin West Africa conference of 1884–5 and the beginnings of German colonialism); compare also (after German) French rouge Congo (1885).] ΘΚΠ the world > matter > colour > colouring > colouring matter > [adjective] > yielding dye > types of dye substantive1794 alizarin1857 Congo red1885 neutral1892 Janus1898 metachrome1901 direct1902 indigoid1908 reactive1941 thioindigoid1943 1885 Jrnl. Soc. Dyers & Colourists 1 146/2 Congo Red... This colouring matter..is of special interest, owing to its remarkable property of dyeing cotton..without the aid of a mordant. 1940 Thorpe's Dict. Appl. Chem. IV. 12/1 Benzidine finds..its greatest application in the manufacture of direct cotton dyestuffs, which result on tetrazotisation..e.g. Congo Red..results from coupling with naphthionic acid. 1960 I. A. Stanton Dict. for Med. Secretaries 36/1 Congo Red test of renal function, a test for amyloidosis. 2014 S. B. Prusiner Madness & Memory ix. 113 When filters that polarize the bright light from the microscope lamp were used, the Congo red bound to the amyloid fibres displayed a characteristic green-gold appearance. < as lemmas |
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