| congo red | <chemical> An odourless, dark red or reddish brown powder which decomposes on exposure to acid fumes. It is used as a diagnostic aid in amyloidosis, and has been used as an antihemolytic and detoxicant. Pharmacological action: dyes. Chemical name: 1-Naphthalenesulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4-amino-, disodium salt (12 Dec 1998) |
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| cresol red | <chemical> A reddish-brown powder which can be dissolved in water or alcohol that has the chemical formula of C21H18O5S. The dissolved compound has different colours depending on the pH, when the pH is 7.2 it is yellow, when the pH is 8.8 it is red, and when the pH is 2-3 it is orangish. As a result, it is used as an acid-base indicator. It is also used as a stain in the study of histology. (09 Oct 1997) |
| scarlet red | O-Tolylazo-o-tolylazo-beta-naphthol. An azo dye; a dark, brownish red powder, soluble in oils, fats, and chloroform, but insoluble in water; used in medicine as a vulnerary, in histology to stain fat in tissue sections and basic proteins at high pH, and in immunoelectrophoresis. Synonym: Biebrich scarlet red, medicinal scarlet red, scharlach red, Sudan IV. (05 Mar 2000) |
| scarlet red sulfonate | An azo dye that has been used to stimulate healing of chronic superficial wounds and ulcers. (05 Mar 2000) |
| scharlach red | O-Tolylazo-o-tolylazo-beta-naphthol. An azo dye; a dark, brownish red powder, soluble in oils, fats, and chloroform, but insoluble in water; used in medicine as a vulnerary, in histology to stain fat in tissue sections and basic proteins at high pH, and in immunoelectrophoresis. Synonym: Biebrich scarlet red, medicinal scarlet red, scharlach red, Sudan IV. (05 Mar 2000) |
| neutral red | <chemical> 3-amino-7-dimethylamino-2-methylphenazine hydrochloride. A vital dye used as an indicator and biological stain. Various adverse effects have been observed in biological systems. Pharmacological action: dyes, indicators and reagents. Chemical name: 2,8-Phenazinediamine, N8,N8,3-trimethyl-, monohydrochloride (12 Dec 1998) |
| Sudan red III | A red stain, (C6H5)N==N(C6H4)N==N(C10H6)OH, used for neutral fat in histologic technique; it also stains the fatty envelope of the tubercle bacillus. Synonym: Sudan red III. (05 Mar 2000) |
| Darrow red | A basic oxazin dye, C18H14N3O2Cl, used as a substitute for cresyl violet acetate in the staining of Nissl substance. Origin: Mary A. Darrow, U.S. Stain technologist, 1894-1973 (05 Mar 2000) |
| quinaldine red | A styrene-quinolinium iodide; used as a pH indicator (turns red at pH 3.2) in a 1% ethanol solution. (05 Mar 2000) |
| International Committee of the Red Cross | A neutral Swiss organization serving as an intermediary between contending forces in armed conflict, in civil war, or internal strife, to help victims receive protection and other humanitarian assistance under the Geneva Conventions in accordance with the fundamental principles of the Red Cross. (05 Mar 2000) |
| oil red O | 1-8-[4-(Dimethylphenylazo)dimethylphenylazo]-2-naphthalenol;a weakly acid diazo oil-soluble dye, used in histologic demonstration of neutral fats. (05 Mar 2000) |
| tanned red cells | Erythrocytes subjected to mild treatment with chemicals such as tannic acid so that they adsorb onto their surface soluble antigens; used in haemagglutination tests. (05 Mar 2000) |
| Tay's cherry-red spot | The ophthalmoscopic appearance of the normal choroid beneath the fovea centralis, appearing as a red spot surrounded by white retinal oedema in central artery closure or lipid infiltration in sphingolipidosis. Synonym: Tay's cherry-red spot. (05 Mar 2000) |
| toluylene red | <chemical> 3-amino-7-dimethylamino-2-methylphenazine hydrochloride. A vital dye used as an indicator and biological stain. Various adverse effects have been observed in biological systems. Pharmacological action: dyes, indicators and reagents. Chemical name: 2,8-Phenazinediamine, N8,N8,3-trimethyl-, monohydrochloride (12 Dec 1998) |
| trypan red | An azo dye formerly used in the treatment of trypanosomiasis. (05 Mar 2000) |