|Contribution||Used phenol (instead of Ehrlich's aniline water) with methyl violet for staining tubercle bacilli.|
|Notes||See 1883. This was the first component of the classic Ziehl-Neelsen stain. Ehrlich's aniline had previoiusly replaced Koch's ammonia as an alkali (alkalinity being necessary for the successful staining of bacteria with methylene blue).|
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