However, internet sleuths believe it was methylene blue, a substance originally used as a Victorian-era medicine and now known for disinfecting fish tanks. The video went viral after Vance Elrod ...

"Methylene blue is often sold at pet stores, as it is a treatment for tropical fish diseases. Now, the interesting thing about methylene blue is that, if ingested, it can temporarily change a person's ...

Though its medical applications have declined with the advent of modern treatments, methylene blue still finds use today—in laboratories, aquariums (as a fish tank disinfectant), and niche ...