Doesn't sound like they're using 100% H2S, I'm sure that would do all kinds of nasty things: > he soon demonstrated that exposing mice to 80 parts per million

Doesn't sound like they're using 100% H2S, I'm sure that would do all kinds of nasty things: > he soon demonstrated that exposing mice to 80 parts per million of the gas mixed at room temperature made it possible to create a reversible suspended animation