Indole test reagent / Kovacs Reagent is used to detect the production of indole by bacteria growing on media containing tryptophan.
| Ingredients | Formula / Litre |
| p-Dimethylaminobenzaldehyde | 50.0 g |
| Iso-amyl Alcohol | 750.0 ml |
| Hydrochloric Acid, conc | 250.0 ml |
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