Acriflavine hydrochloride is a chemical compound that has been used historically as an antiseptic and antibacterial agent. It belongs to a class of dyes known as acridines. Acriflavine was commonly used in the mid-20th century for various medical purposes, including as a topical antiseptic for wounds and as an antimalarial agent. However, its use has declined over the years due to the development of more effective and safer alternatives. Acriflavine hydrochloride may still be used in certain specialized applications or research settings.