Born as a coal-tar dye, reborn as a “magic bullet,” methylene blue has taken an improbable journey from textile vats to today ...

Add Yahoo as a preferred source to see more of our stories on Google. A solution of methylene blue in an erlenmeyer flask. The trending dye was invented by German chemist Heinrich Caro in 1876.

Wellness enthusiasts seeking to hack their way to health and longevity have a new favorite remedy — one that stains their tongues blue. Methylene blue has been around since the 1870s when it was used ...