תלמוד על שבת 51:4

Some Tannaim state, one kindles with naphtha; but some Tannaim state, one does not kindle with naphtha. Rav Ḥisda said, he who said one kindles, if it was black; and he who said, one does not kindle, if it was white, because it represents danger⁸⁶Babli 26a where using white (light) naphtha is forbidden even on weekdays because of the danger of an explosion..