PH Independent Redox Indicators
| Indicator | E0, V | Color of Oxidized form | Color of Reduced form |
|---|---|---|---|
| 2,2'-bipyridine (Ru complex) | +1.33 V | colorless | yellow |
| Nitrophenanthroline (Fe complex) | +1.25 V | cyan | red |
| N-Phenylanthranilic acid | +1.08 V | violet-red | colorless |
| 1,10-Phenanthroline (Fe complex) | +1.06 V | cyan | red |
| N-Ethoxychrysoidine | +1.00 V | red | yellow |
| 2,2`-Bipyridine (Fe complex) | +0.97 V | cyan | red |
| 5,6-Dimethylphenanthroline (Fe complex) | +0.97 V | yellow-green | red |
| o-Dianisidine | +0.85 V | red | colorless |
| Sodium diphenylamine sulfonate | +0.84 V | red-violet | colorless |
| Diphenylbenzidine | +0.76 V | violet | colorless |
| Diphenylamine | +0.76 V | violet | colorless |
| Viologen | -0.43 V | colorless | blue |
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