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That isobutanol is isobutyl alcohol, the least toxic of the butanols, and is there merely as a solvent. In other words, it evaporates pretty quickly at room temperature and leaves the mineral oil...

Far from being high-tech it is really rather old-tech: its roots go back to at least 1904. It is thin, has good 'creep' so it penetrates, is mildly alkaline so it neutralises acids, can form an...