Interesting, I never knew naptha was the only fuel for Davies lamps. I presume the naptha ban is the reason behind the new formula for lighter fuel. Naptha is nasty stuff.Ozgraver; Naptha is basically unavailable here in the states, The only places that it is available, is from chemical supply houses, or from mine safety suppliers (used in Flame Safety Lamps). And you have to show a need to have and use it. It is used in the Flame safety lamps or Davies Lamp, because it is the only fuel that will burn at the correct air fuel mix to show the oxygen content of an area.