. Biological stains; a handbook on the nature and uses of the dyes employed in the biological laboratory. Stains and staining (Microscopy); Stains and Staining; Dyes. 84 Biological Stains textile dye or in microscopic technic. It has been called for by Ehrlich, however, in combination with pyronin and methyl green or methylene blue to form a neutral dye. It is no longer on the market, however. c81 AMARANTH C. I. NO. 184 Synonyms: Naphthol red S, C or 0. Fast red. Bordeaux. Bordeaux SF. Victoria rubin 0. Azo rubin. Wool red. N = N HO \. NaSOs SOsNa NaSOs C2oHiiN20ioS3Na3; Mol. Wt. {An a
. Biological stains; a handbook on the nature and uses of the dyes employed in the biological laboratory. Stains and staining (Microscopy); Stains and Staining; Dyes. 84 Biological Stains textile dye or in microscopic technic. It has been called for by Ehrlich, however, in combination with pyronin and methyl green or methylene blue to form a neutral dye. It is no longer on the market, however. c81 AMARANTH C. I. NO. 184 Synonyms: Naphthol red S, C or 0. Fast red. Bordeaux. Bordeaux SF. Victoria rubin 0. Azo rubin. Wool red. N = N HO \. NaSOs SOsNa NaSOs C2oHiiN20ioS3Na3; Mol. Wt. {An acid dye; absorption maximum about 525) Solubility at 26°C: in water ; in alcohol Amaranth is not a commonly used stain, but is of considerable importance as a food color. It has been used by Griesbach (1886) for staining axis cylinders, by Chambers (1935) in staining cells in tissue culture; also by Smith (1939) in color photomicrography. c85 METHYL RED C. I. NO. COOH CHa / /~\_N=N/ CH3 C15H15N3O2; Mol. Wt. {A weakly acid dye; absorption maximum 530) This dye has rarely been used for staining, but has long been employed as an indicator. Its useful range is from pH to pH in which it changes from red in acid solutions to yellow in basic. Although still of value for this purpose it is coming to be replaced by certain of the sulfonphthalein indicators such as brom cresol green and chlor cresol green (see page 203), which are more stable chemically and permit greater accuracy in reading. The chief drawback to methyl red as an indicator is that it is easily reduced with loss of color, and readings must be made very prompt-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Conn, H. J. (Harold Joel), 1886-1975. Geneva, N. Y. , Biotech Publications
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