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I have heard people use vegetable oil just a couple drops
This
ya get spotted squirting oil or alcohol down a fishing hole by the DEC you won't have to worry about your hole freezing closed for awhile
Any form of veg oil would be fine. Anything else would bring the heat if caught. Either way oil and alcohol and other liquids would hinder the fish activity anyway. Foreign stuff don’t do good underwater.
http://www.boxtipups.comCharcoal is organic.