Mainly dimethoate, carbendazim and sodium trichloroacetate through a custom-made spray tower onto glass plates on an analytical balance. They are horrifically toxic, so we need to vent them from the spray cabinet as quickly as possible, but as the spray deposition is weighed in real time we can't have the extractor running during application otherwise the balance goes haywire. I take it that none of those chemicals are flammable and likely to cause an explosion then in the presence of an electrical spark. No, they should all be fine. Incidentally, there was a story in the industry some years ago of a lab who were conducting pesticide residue analysis on glace cherries, the extraction procedure for which involved macerating the glycerine-soaked cherries in nitric acid. Apparently it dawned on them that they had inadvertently manufactured nitroglycerin when the fume hood exploded.