MSDS – Methylene Blue
Also, (and I swear this is not a joke) there is a website out there called, UrineColors.com, (It’s official, there is now a website for everything.) Now I can’t recommend Methylene Blue, but, according to Urine Color’s website, man’s favorite little blue pill, Viagra can turn your pee blue. So if you want to give your buddy a “hard time” and blue urine… Just saying…
Use eye drops. Its safer