Odd fuel additive question

Yea, it works, but I wouldn't do it with a catalitic converter equipped car. I ran across a bag of them the other day, cleaning a cabinet, the active ingredient is Naptha. Naptha is or was an ingredient in gasoline. I know some guys used to add them to 18 wheeler's fuel, they shoot blue flames out the pipes at night. I think they used to have Benzene in them too.