Uses. It is used to dye polyacrylonitrile fibers. Pararosaniline is used as a colorimetric test for aldehydes, in the Schiff test. It is the only basic fuchsine component suitable for making the aldehyde-fuchsine stain for pancreatic islet beta cells.

The basic fuchsin is a cationic triphenylmethane dye used for the detection of acid-fast bacilli and is commonly used in the Ziehl Neelsen staining technique. It stains mucopolysaccharides and glycoproteins. It can also be used to track proteins in acidic pH systems.

Fuschsine or rosaniline hydrochloride is a magenta-colored dye with a chemical formula C20H20N3·HCl, which is decolorized by

PARAROSANILINE BASE FOR MICROSCOPY