The main ingredient is Methane gas. http://en.wikipedia.org/wiki/Nitromethane
You can buy liquid nitro at a coolant store
THE CORNDOG AND Travis
What year was my king nitro made serial #29749
what year was the nitro hunter singal shot shotgun 12G made.
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There ISN'T a Nito but there is a Nitro and Nitro End Of Days made by Madd Gear Pro Scooters.
The Lefever Nitro Special was made by Ithaca. Yours was made in 1923.
I would say that with the serial number 1321XX,we are looking at your shotgun being made by ithaca(who made the lefever nitro special) in 1924.
Nitro King was a Sears Roebuck brand name made by Crescent Arms, 1908-1917.
Nitrobenzene is a pale yellow to light brown liquid at room temperature.
Ithaca Firearms manufactured the Lefever Nitro Special with serial numbers between 100000 and 101599 in 1921.
You will have to state who made it.