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Taste aside, is it safe for drinking? Whiskey that was left inside a stainless steel flask?

Stainless steel flask

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If whiskey held in cheap flasks for months or even years was a serious health threat, it would have been obvious a hundred years ago. – Carey Gregory May 25 '13 at 0:55
Life expectancy 100 years ago was 55 years. Today it's in the high 70's. No one then would have the technology to know if you died from lead poisoning from ceramic, steel, paint or iron. Also, remember, this is the China that made toothpaste with anti-freeze as an ingredient not very long ago. ...And OP uses MS-DOS, no way! – Paulb Jan 29 at 20:20
up vote 8 down vote accepted

Whiskey is quite high in alcohol, on the order of 40% by volume, and is not hospitable to pathogens growing.

The flask is intended to hold liqueur, and so is made from or lined with a food safe material, such as food grade stainless steel (assuming you have one from a reputable manufacturer).

So yes, it should be fine.

Remember: when it was brewed, the whiskey was probably held at different stages for long periods in a stainless steel vat.

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"assuming you have one from a reputable manufacturer" - well, that's the problem, it's a chinese brand, named "Honest". It's REALLY well built, but I'm not sure... – Somebody still uses you MS-DOS May 24 '13 at 23:04
Well... would you use anything for food or drink that isn't from a reputable manufacturer? Perhaps that is your real question. – SAJ14SAJ May 24 '13 at 23:16
@SomebodystillusesyouMS-DOS: Alcohol is a preservative. It's as safe now as it was a month ago. If you don't trust the manufacturer then maybe it wasn't safe a month ago, but as long as it's actually stainless steel then it hasn't gotten any worse since then. – Aaronut May 25 '13 at 0:36
Whiskey in the US is commonly "80 proof," which is 40% alcohol by volume. I'd be interested to know if there are other places where whiskey is commonly 80% alcohol, as then I'll feel cheated. I did find reference to one even stronger, Bruichladdich Though that is scotch whiskey. – Tim B May 25 '13 at 12:12
@TimB The reason 40% is so common is that it's not legal to sell anything lower-strength and still call it whisk(e)y, and because it's the common opinion that it's the optimal balance of flavour and least burn. It comes from the still around 95% and then is diluted to aging strength, about 65–70%, before barrelling, and comes out of the barrel around 60% due to evaporation. You can get "cask-strength" whisk(e)y from a number of distilleries, but often they're best with water added anyway; I have a 59.0% Aberlour A'Bunadh that's good neat and diluted down to 40%. – SevenSidedDie May 27 '13 at 0:06

Do keep in mind, though, that some cheap flasks will have plastic liners on the inside - you may want to see if this is the case with your flask. (A month is not particularly long, though.)

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Welcome to the site! I was wondering about your answer, since it does not really answer the question, imho. If there is a plastic liner, is the whiskey not safe to consume? – Mien Jun 14 '13 at 11:50
Thanks. Safety issues regarding chemicals leaching out of plastic into liquids have recently drawn some attention from regulatory agencies. For example, the FDA (as well as equivalent agencies in the EU and Canada) have recently declared bisphenol A (a common component in the production of many plastics, as well as liners for beverage cans) to be toxic, due to increased cancer risk and weird hormonal effects. I realize that doesn't really answer your question, sorry. Potentially informative link below:… – user18740 Jun 14 '13 at 12:09

I have a dozen stainless flasks, that i place 80 proof whiskey in and age an additional 4 years before drinking.......some of the best stuff I've ever drank.

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Tasty or not, this has nothing to do with its safety. For a food to be declared officially safe, it must meet very stringent criteria. Matters of public health are settled with large studies, not with taste or "I did it and didn't suffer any problems". – rumtscho May 5 '14 at 19:55

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