Alizarin
Alizarin is a dihydroxyanthraquinone that is anthracene-9,10-dione in which the two hydroxy groups are located at positions 1 and 2. It has a role as a chromophore, a dye and a pla…
Indicators
Substances that show a chemical change by color change
21 chemicals in this category
Brilliant green
Brilliant green is an organic hydrogensulfate salt having 4-{[4-(diethylamino)phenyl](phenyl)methylidene}-N,N-diethylcyclohexa-2,5-dien-1-iminium as the counterion. It has a role a…
Bromocresol green
Bromocresol green (C21H14Br4O5S) is a chemical indicator. It has a molecular weight of 698.0 g/mol. Its IUPAC name is 2,6-dibromo-4-[3-(3,5-dibromo-4-hydroxy-2-methylphenyl)-1,1-di…
Bromocresol purple
Bromocresol purple is a member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3-brom…
Bromophenol blue
Bromophenol blue is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3,5-dibromo-4-hydroxyphenyl groups. It is used as a labor…
Bromothymol blue
Bromothymol blue is a member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 3-bromo-…
Congo red
Congo Red is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0. It contains a 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonate). It is f…
Cresol red
Cresol red is a member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxy-5-me…
Crystal violet
Gentian Violet can cause cancer according to an independent committee of scientific and health experts.
Eriochrome Black T
Eriochrome Black T (C20H12N3NaO7S) is a chemical indicator. It has a molecular weight of 461.4 g/mol. Its IUPAC name is sodium 3-hydroxy-4-[(1-hydroxynaphthalen-2-yl)diazenyl]-7-ni…
Fluorescein
Fluorescein (lactone form) is a xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytic…
Malachite green
Malachite green is an organic chloride salt that is the monochloride salt of malachite green cation. Used as a green-coloured dye, as a counter-stain in histology, and for its anti…
Methyl orange
Methyl orange (C14H14N3NaO3S) is a chemical indicator. It has a molecular weight of 327.34 g/mol. Its IUPAC name is sodium 4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate.
Methyl red
Methyl red is an azo dye consisting of benzoic acid substituted at position 2 by a 4-[(dimethylamino)phenyl]diazenyl group. It has a role as a dye. It is a member of azobenzenes, a…
Methylene blue
Methylene blue is an organic chloride salt having 3,7-bis(dimethylamino)phenothiazin-5-ium as the counterion. A commonly used dye that also exhibits antioxidant, antimalarial, anti…
Murexide
Murexide (C8H8N6O6) is a chemical indicator that appears as Purple-red solid with a green metallic luster; [Merck Index] Dark red powder; [Sigma-Aldrich MSDS]. It has a molecular w…
Neutral red
Neutral red is a hydrochloride obtained by combining the free base of neutral red with one equivalent of hydrochloric acid. Neutral red acts as a pH indicator, changing from red to…
Phenol red
Phenol red is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yel…
Phenolphthalein
Phenolphthalein can cause cancer according to The Food and Drug Administration (FDA) and The National Toxicology Program.
Safranin
Safranin O is an organic chloride salt having 3,7-diamino-2,8-dimethyl-5-phenylphenazin-5-ium as the counterion. It is commonly used for staining Gram negative bacteria. It has a r…