oh the test for safe butane is as follows... get a mirror.. spray the shit on a mirror, set it aside... if everything evaporates and leaves no residue (of course it's important to start with a completely clean mirror) it's safe to use... if it leaves residue behind (you'll know, you ain't gotta ask) find a new one... ronson i swhat i've used so far.. most butanes are safe, the only reason for this warning, is cuz not ALL are safe..