[Old Possum]

Hello all.
In Australia, we add ethane thiol to the natrual/LPG gas to give it a unique odour.
I have in my stores here 2 L of ethane thiol in 500 mL bottles, they have never been opened, they are still sealed, they still contain 500 mL each, they are stored in my 4 degC Fridge, and whenever I open that fridge, I stink out the entire floor of the building. (7500 m3) Humans are especially sensitive to ethane thiol, we can smell it at concentrations as low as 1 part per 50 BILLION. Also when I used to work in a mine, ethane thiol was used as the Emergency evacuation notifaction; As it will pass straight through any air filter or scrubber in existence, in addition to having a very rapid dispersion speed. If you ever smelt etahne thiol while down in the mine, that meant you must evacuate immediately.
BTW pretty much all noxious smelling compounds contain sulphur ( thiols ,thioethers, or sulphoxides )