Neutral red is a eurhodin dye used for staining in histology. It stains lysosomes red.Neutral red can be used as a vital stain.Neutral red acts as a pH indicator, changing from red to yellow between pH 6.8 and 8.0.
Neutral red is a vital dye widely used as a cellular pH indicator and is selective for shifts in pH. It is highly lipophilic in nature. It favours membrane potential dependent fluorescence that attributes to changes in hydrophobicity.