Pararosanilin ~ 4%, methanolic, is used as a high quality laboratory chemical for staining tissue samples in medical and histological diagnostics. It is used in staining kits such as the chloroacetate esterase staining kit and can contribute to the detailed visualization of cell structures.

Chemically, the product consists of a solution of pararosaniline, a triphenylmethane dye, in methanol. The bright red color of pararosaniline results from its delocalized electron structure and provides excellent color perception. Methanol serves as a solvent in this case and allows effective tissue penetration, allowing the dye to penetrate deep into cellular structures.

With the use of the pararosaniline solution, tissue samples can be stained, improving contrast and thus visibility of cellular structures. This enables precise histological examination and helps to achieve accurate and reliable diagnostic results.