Phosphomolybdic acid in concentrations ranging from 1% to 5% is an aqueous solution used in histology and cytology as a stain and dye component. The solution is used in various staining protocols to facilitate the binding of dyes to specific cellular structures or to increase color intensity.

A well-known example is Goldner trichrome staining, in which phosphoromolybdic acid is used in combination with other dyes, such as orange G or aniline blue, to selectively stain different tissue components. In this staining technique, phosphoromolybdic acid causes more intense binding of dyes to collagen and other extracellular matrix structures, resulting in improved color separation and contrast between different tissue components.

Phosphoromolybdic acid is a complex acid consisting of molybdenum, phosphorus and oxygen that is used in histology and cytology for staining and staining purposes. In concentrations of 1 to 5%, phosphomolybdic acid is often used to stain structures containing nucleic acids because it has a higher affinity for these structures than phosphotungstic acid. The acid can be used in various staining protocols to increase color intensity and achieve better visualization of target structures.