I keep white rice in buckets in my basement. I found a bag that had been opened at least five years earlier, and it still cooked up great.
“Mophead”
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There are kid’s cereals that keep in Mylar with 02 absorbers. They have to be low fat, low moisture, and high sugar.
“Pu60”
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Even if it’s rancid, vegetable oil can still make old-fashioned lye soap. It will still clean stuff. Add a fresh fragrance. That helps.
“Tinker Young”