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I bought this massive bag of shelled walnuts at Costco. I just love cooking with walnuts.
We've had the bag open for about a week...and I just now noticed that it said it should be refrigerated after it was opened.
Do walnuts go rancid if they're not refrigerated?

We've had the bag open for about a week...and I just now noticed that it said it should be refrigerated after it was opened.
Do walnuts go rancid if they're not refrigerated?