neutral red

(redirected from Toluylene red)
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neu·tral red

(nū'trăl red), [C.I. 50040]
Used as an indicator (red at pH 6.8, yellow at 8), as a vital dye to stain granules and vacuoles in living cells, in testing the secretion of acid by the stomach (given with a test meal), and in general histologic staining.
Synonym(s): toluylene red