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I did some research.

The problem with denatured alcohol is that it contains a variety of additives that makes the alcohol unfit for human consumption. But it seems that it is not made public what is added, most likely to prevent others to try to remove them and than make money on selling it for consumption. Some of the potential additives may be problematic. If the actual composition would be provided, maybe some denatured alcohol could be used. (For example if "denaturation" is made by iso-propanol and or ethanol).