Hi Susan, The denaturing (i.e. making it unpotable) agent for alcohol *used* to be some kind of oil. The 190 proof alcohol used to be sold by the Ontario liquor board store. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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