| 单词 | congo brown |
| 释义 | > as lemmasCongo brown b. In the names of various dyes, stains, and indicators which resemble Congo red in being azo compounds mostly derived from benzidine or tolidine, as in Congo blue, Congo brown, Congo corinth, Congo orange, Congo rubine, etc. Also in other terms denoting or relating to this group of dyes, as in Congo-acid, Congo dye, Congo paper. Now chiefly historical. [In some formations probably after German models, e.g. Kongorubin, Kongobraun, Kongopapier (apparently all late 19th cent.); Congo corinth may be directly < German Kongokorinth (late 19th cent.).] ΚΠ 1886 London Med. Rec. 15 Nov. 487/1 To test the secretion it will be necessary to give a trial meal, and in about six hours to examine the contents of the stomach. The latter must also be examined with regard to the presence of free hydrochloric acid... For this, Congo paper is of great value. 1898 Applic. Benzidine Colours All Branches Printing 49 (caption) Aniline Black discharged with Congo Orange G. 1905 J. C. Cain & J. F. Thorpe Synthetic Dyestuffs xi. 70 A mixed benzidine dyestuff—Congo Corinth—is produced. 1905 J. C. Cain & J. F. Thorpe Synthetic Dyestuffs xi. 73 Congo brown G [A]..Congo brown R [A]. 1910 Polytechnic Engineer 10 21 (heading) The investigation of Congo blue and the preparation of Congo white. 1915 Jrnl. Chem. Soc. 108 i. 321 Blue and Red Congo Dyes. 1915 Jrnl. Chem. Soc. 108 i. 322 Isomeric Congo-acids have been isolated. 1920 Jrnl. Chem. Soc. 118 ii. 171 Colour Change of Congo-rubin. 1922 R. N. Shreve et al. Dyes Classified i. 127 Dyes derived from Benzidine..Congo Rubine. 1940 Thorpe's Dict. Appl. Chem. IV. 219 Congo Corinth GW: Benzidine, Naphthionic acid, N.W.-acid. < as lemmas |
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