Phosphotungstic acid - methyl blue is an essential component of the SHOOBRIGDE polychrome staining kit used as an in vitro diagnostic. This specific product enables the visualization and differentiation of various cellular structures and proteins to provide clinically relevant information.

Phosphotungstic acid acts as a mordant, binding to proteins and increasing their affinity for dyes. Methyl blue, a basic aniline dye, binds to acidic components, especially nucleic acids, and stains them blue. Through this interaction, the product enables differential staining of tissues or cells and improves contrast.