Fast Blue B Salt is a stain that is used for the determination of various compounds. It has been used to demonstrate esterase activity. Histochemically it has stained enterochromaffin cells and cells that have gone under free radical oxidative damage.主要用于测定各种生化物质：如蛋白质；酶；胆红素。 Fast Blue B Salt is a stain that is used for the determination of various compounds. It has been used to demonstrate esterase activity. Histochemically it has stained enterochromaffin cells and cells that have gone under free radical oxidative damage. A stain that is used to detect various enzymes, proteins, and cell types