I cannot see a simple test for hexane. You will need a gas chromatograph or the like. I cannot imagine that small residual amounts of hexane have any neurotoxic effect. You really should look up the maximum concentrations permissible. The hexane will probably be used to extract the Shea Butter as it is a good solvent for lipids, and is then evaporated, as far as possible without damaging the end product. There is a simple principle in chemistry: you can find almost everything almost anywhere, if your methods are sensitive enough (think of nitrosamine in beer a couple of years ago). But it is the concentration that matters. Best regards - H.Oe.
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