Romanowsky blood stain
Definition: prototype of the eosin-methylene blue stains for blood smears, using aqueous solutions made of a mixture of methylene blue (saturated) and eosin. Romanowsky-type stains depend for their action on compounds formed by interaction of methylene blue and eosin; most are of no value if water is present in the alcohol because neutral dyes precipitate.
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Examples: glitazone, GI cocktail, etc.