patent blue v calcium salt

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

Fast Blue B Salt, a fat-soluble and phenolic compound-binding dye, serves for semi-quantitative analysis of alkylresorcinols in rye and forms a colored precipitate upon acetone exposure [1]. It also demonstrates affinity for diazonium compounds.

Patent Blue V (Acid blue 1), a biological dye, serves as an intraocular stain in retinectomy—surgical removal of the inner limiting membrane (ILM). Its use facilitates the complete excision of premembrane structures in vitreoretinal surgeries. Spectral analysis reveals that Patent Blue V absorbs strongly below 450 nm and above 600 nm, exhibiting a blue-green hue. Additionally, it functions as a tracer in lymphangiography to guide the surgical removal of cancerous lymph nodes [1][2].