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Which preserves diced onions better? A plastic or metal container?? I'm trying to figure out which is a better storage container.

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    Glass. Plastic absorbs smells, metal can react chemically. – Joe Jan 28 at 12:02
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The key thing to look for is that the container closes as tight as possible. Metal or plastic doesn't matter. However, I would probably use metal or glass, since plastic can absorb some of the flavour of the raw onions. This would then make that container unsuitable for storing other things.

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    And I hope that by 'metal' the OP means good stainless steel. Anything else is likely to react badly with the onion – user57361 Jan 30 at 22:10

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