Many compasses use alcohol, but the poisonous, foul-tasting, industrial type; I suspect that someone is letting their fantasies take hold. For one thing, the compass would be more difficult to read, if it contained a brown, rather than clear, liquid.
The idea seems to be if the alcohol evaporates or is lost the pilot would top up the gauge with Whiskey presumably from his hip flask. I’ve heard this from various people. But never actually had someone say they did it or found some in a gauge. I think this might be the aviation equivalent of the tarantulas in bannanas myth.
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