IIRC, DiMethyl Mercaptan - lovingly called "essence of skunk". Used for
many years in the rocketfuel industry to odorize dangerous chemicals. There
was one, called a boron hydride that you couldn't smell until it got to
around 20 parts per million. Problem was that it was fatal at 10ppm. Used
Pyridine to odorize it.

Ah lots of fond memories about pranks using pyridine and $100K worth of
special glass filters used just to make coffee in the lab.

God bless the Polaris missile - paid for a lot of toys.

"Gus" wrote in message
oups.com...
I can't answer your questions but want to point out that NOTHING
stinks worse
than OLD kerosene--as in a lamp.

Obviously, you've never experienced that heady elixir known as
Pyridine.

Now THAT'S a stench !

Gus