I would think it has to be an atypical flame to build up molecules vs burn them to co2 and water. Unless there’s polycyclic aromatics being broken up. LP gas

I would think it has to be an atypical flame to build up molecules vs burn them to co2 and water. Unless there’s polycyclic aromatics being broken up. LP gas has to do some interesting chemistry to make benzene from raw carbon and hydrogen. So perhaps some ionization is needed to catalyze or enable these reactions.