You can detect grain, wood or rubbing alcohol with the "iodoform test". Treat the sample with iodine and sodium hydroxide; if these alcohols are present, you get a cloudy yellow precipitate (CHI3). The test can be fooled by some ketones (for example, nail polish remover will give a positive test because it contains acetone).
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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/organic/faq/print-alcohol-test.shtml