In article <o6p14k$c9n$
1...@dont-email.me>,
Spray bottle with some dish detergent and a few drops of glycerine.
Bic lighter is by far more handy.
One story industrial building where the
plumbers left a four inch low pressure
gas supply pipe uncapped overnight.
Next morning could hardly smell the mercaptan.
To get a gas explosion requires careful engineering
OR
tens of thousands of trials.
--
Michael Press