Congo red

Congo red
Congo red Congo red (Chem.) An artificial red dye from which the Congo group received its name. It is also widely used either in aqueous solution or as test paper (

{Congo paper}) for the detection of free acid, which turns it blue. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Congo red — IUPAC name sodium sodium 3,3 ([1,1 biphenyl] 4,4 diyl)bis(4 aminonaphthalene 1 sulfonate) …   Wikipedia

  • Congo red — n. a sodium salt, C32H22O6N6S2Na2, used for dyeing wool and cotton and as an acid base indicator: it becomes blue in an acid solution and remains red in an alkaline or neutral solution …   English World dictionary

  • Congo red — Chem. a water soluble powder, C32H22O6N6S2Na2, one of the Congo colors that is not acid fast or lightfast: used chiefly as a dye, biological stain, and chemical indicator. [1880 85] * * * ▪ dyestuff       first of the synthetic dyestuffs of the… …   Universalium

  • Congo red — An acid direct cotton dye, it is absorbed by amyloid and induces green fluorescence to amyloid in polarized light; used as a laboratory aid in the diagnosis of amyloidosis, as a histologic stain, and as an …   Medical dictionary

  • congo red — noun a red brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) • Topics: ↑solution • Hypernyms: ↑azo dye, ↑acid base indicator …   Useful english dictionary

  • congo red — kongo raudonasis statusas T sritis chemija apibrėžtis Indikatorius. formulė [NaSO₃(H₂N)C₁₀H₅N=NC₆H₄]₂ atitikmenys: angl. congo red rus. конго красный …   Chemijos terminų aiškinamasis žodynas

  • Congo red — /kɒŋgoʊ ˈrɛd/ (say konggoh red) noun one of the Congo colours, used especially to dye cotton, etc., red. Since it is not acid fast or light fast, it is often used as a chemical indicator …   Australian English dictionary

  • Congo red — noun Etymology: Congo, territory in Africa Date: 1885 an azo dye C32H22N6Na2O6S2 that is red in alkaline and blue in acid solution and that is used especially as an indicator and as a biological stain …   New Collegiate Dictionary

  • Congo Red — Strukturformel Allgemeines Name Kongorot Andere Namen 3 …   Deutsch Wikipedia

  • Congo red — Naphthalene dye that is pH sensitive (blue violet at pH 3, red at pH 5). Used as vital stain, also in staining for amyloid …   Dictionary of molecular biology

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