Neutral Red

Neutral Red Chemical formula

Chemical information

CI Basic Red 5; Colour Index No. 50040; Neutral Red Chloride; Nuclear Fast Red; Rojo neutro; Toluylene Red. 3-Amino-7dimethylamino-2-methylphenazine hydrochloride.
Chemical formula: C15H16N4,HCl = 288.8.
CAS — 553-24-2.


Neutral red is used as an indicator for alkalinity and for preparing neutral-red paper. It is also used as a stain in microscopy. It is a photoactive dye that has been tried in photodynamic therapy of recurrent herpes simplex infections, but with limited success.
Published May 08, 2019.