| Date | 1881 |
| Author | Ehrlich |
| Contribution | Reported the utility of the basic dye, methylene blue, for staining acid-fast bacteria. |
| Reference | Anon. |
| Notes | Acid-fast refers to retention of dye (carbolfuchsin) when an acid solution is used to de-stain. See also Ehrlich 1882 re aniline water and methyl violet. |
| Category | Miscellany |
| Pathogen Class | Bacteria |
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