Methaline blue is an industrial dye that was used in clothing and fish tanks. The original blue jeans were made using these. It has one generally accepted medical use to day, which is the treatment of met hemoglobineria or methimoglobinea. One of the major drivers of alsheimer's disease is an energy deficit of the nuron. A study looked at a methyline blue like compound along with some anti-drugs. Study failed on its primary outcome but did show improved cognition.