 Evidence given suggests that there were no other obvious candidates as fuel for the explosion; no oils, no naphtha nor oils of vitriol.Great lengths were taken, including the posting of a reward for information, to ascertain whether gunpowder was stored in the warehouse; but all evidence pointed against it.A number of chemists, including the government chemist, tested residues found on the scene, as well as black dust which fell on the spectators, looking for the remains of combusted gunpowder; but none was found.