Proflavine is a multifunctional acridine compound. 3,6-Diaminoacridine is an acridine dye and also a DNA inserter. Proflavine is a potent broad-spectrum antibacterial agent, and its mechanism is to insert into bacterial DNA, interfering with replication and transcription, causing bacterial lysis. 3,6-Diaminoacridine is a Kir3.2 potassium channel blocker and can be used to study the neurological phenotype of Down syndrome. 3,6-Diaminoacridine can penetrate the stratum corneum of the skin and accumulate in the cell nucleus and long-term exposure may induce skin cancer or other malignant tumors[1][2][3].