Acid blue is a dark bluish synthetic triphenylmethane dye. It used as a food coloring. The color of the dye is pH-dependent. The structure is also redox-sensitive, changing from a reduced yellow form to an oxidized red form in solution. It is usable as a reversible redox indicator in some analytical methods.

3536-49-0

C54H62CaN4O14S4

1159.42

NSC 5010;Blue ZN 3;Food Blue 3;Acid blue 3;C.I. 42051;L-Blau 3;Patent Blue V calcium salt

DMSO:Soluble
Powder: -20°C for 3 years
In solvent: -80°C for 2 years