[C.I. 52040] a blue basic dye, used as an antibacterial agent, as a nuclear stain, and to stain metachromatically certain structures (e.g., the granules in mast cells; cartilage matrix that is rich in chondroitin sulfate), and in electrophoresis to stain RNA, RNase, and mucopolysaccharides; it also antagonizes the anticoagulant action of heparin.tolonium chloride.
