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Indicators and Dyes for Chemical Processing - Alfa Aesar

Alfa Aesar is proud to offer our line of indicators, many of which are available in both solutions and powdered forms.

Indicators are related to stains and dyes. These reagents indicate the presence, absence, or concentration of another substance by means of a characteristic color change. Indicators are commonly used to determine pH or to detect the presence of metal ions.

Please refer to our table of indicators which lists our indicators by name and gives the approximate pH range and color change for each one.

  • 2,3,5-Triphenyl-2H-tetrazolium chloride, 98%
  • 2,4-Dichlorobenzenediazonium 1,5-naphthalenedisulfonate hydrate, 97%
  • 2,6-Dichloroindophenol sodium salt hydrate
  • 2',7'-Dichlorofluorescein
  • 2,9-Dimethyl-1,10-phenanthroline hemihydrate, 98+%
  • 2-Aminofluorene, 98%
  • 2-Chloro-4-nitrophenol, 97%
  • 3,3',5,5'-Tetrabromobisphenol A, 97%
  • 3,3',5,5'-Tetraiodophenolsulfonephthalein
  • 3,5-Dihydroxytoluene, 99%
  • 4-(2-Pyridylazo)resorcinol monosodium salt monohydrate
  • 4',5'-Dibromofluorescein, ca. 95% dye content
  • 4-Bromomethyl-6,7-dimethoxycoumarin, 95%
  • 4-Chloro-7-nitrobenzofurazan, 99%
  • 5(6)-Carboxyfluorescein, mixture of isomers, 97%
  • 5-Carboxyfluorescein, single isomer, 97%
  • 7-Amino-4-methylcoumarin, 98%
  • Acid Fuchsin sodium salt
  • Acridine, 97%
  • Acridine Orange
  • Alizarin, 94%
  • Alizarin Complexone, may cont. up to 10% water
  • Alizarin Red S sodium salt
  • Alizarin Red S sodium salt, 1% w/v aq. sol.
  • Alizarin Yellow R sodium salt
  • Alkali Blue 4B
  • Aluminon
  • Amido Black 10B
  • Azocarmine G
  • Azomethine-H monosodium salt hydrate
  • Azure I
  • Azure II
  • Basic Fuchsin
  • Bathocuproin, 98%
  • Bathocuproin sulfonate disodium salt hydrate, 97%
  • Bathophenanthroline, 98+%
  • Beryllon II
  • beta-Naphthol Violet
  • Bismarck Brown Y
  • Bisphenol A diglycidyl ether
  • Biuret, 97%
  • Blue Tetrazolium chloride
  • Brilliant Blue G, ultrapure
  • Brilliant Crocein
  • Brilliant Green
  • Bromocresol Green
  • Bromocresol Green sodium salt
  • Bromocresol Green sodium salt, 0.04% w/v aq. soln.
  • Bromocresol Purple
  • Bromocresol Purple sodium salt

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