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Do you blow on your containers before closing them?

Many moons ago I watched some 'expert' on TV, demonstrate how they blow air from their lungs into/onto the contents of a jar they had opened and were then quickly closing the lid on to but back in the fridge. The reason they said was if you do that you are briefly blowing away the oxygen in the jar and replacing it with carbon dioxide. This would then slow down the rate of spoilage. Does anyone do this? I admit I did do it for a week of so but it then occurred that maybe the carbon dioxide coming out of my lungs might contain some viruses etc. Is this so?

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  1. I use a bicycle pump. Far more efficient.

    1 Reply
    1. re: beevod

      How do you get carbon dioxide from a bicycle pump? Doesn't that just replace the oxygen with new oxygen?

    2. Goofy. There is plenty of oxygen left in the air that comes out of your lungs AND you take the chance of filling your jar with bacteria/viruses.

      1 Reply
      1. re: sparrowgrass

        Yes. I would not want to eat something that someone else had blown on.

      2. Aspirated air doesn't contain much more carbon dioxide than ambient air.

        1. No. Sometimes I suck the air out of a ziploc, but that's different.

          1. That may be the weirdest, possibly most useless thing I ever read.

            2 Replies
            1. re: chicgail

              ah but a challenge to find something even dumber! yes I aspirate a protective layer of spittle before storing my leftovers - it's that personal touch.