neutral red(redirected from Toluylene red)
Also found in: Encyclopedia.
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