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Coffee & Tea

Coffee Bean Explosion

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Coffee Bean Explosion

CliffA | Feb 4, 2004 08:55 AM

I store whole coffee beans in a mason jar. The jar has a screw ring that retains a lid with an integral rubber seal. This jar is meant for canning and, even without processing, the seal is very tight-- airtight, apparently.

On a daily basis, i haven't noticed anything. However, i went away for a week. When i opened the jar on the first morning back, the lid and ring flew out of my hands, accompanied by a loud "foomf" noise. Obviously, the beans are outgassing something. What? What's going on?

Thanks.

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