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    Then how come I can buy grated cheese in bags and that keeps in the fridge for weeks? Commented Nov 24, 2020 at 17:42
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    @Robert Store bought grated cheese has preservatives that help it last longer. Commented Nov 24, 2020 at 20:39
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    @DestinColeman - neither the Grana Padano nor the Parmigiano I buy in grated packs here in Austria has any additives listed vs. the whole pieces. Not to say that maybe some stuff doesn't need to be listed? But I suspect it's just that it's packed with some gas that inhibits spoiling. Commented Nov 25, 2020 at 20:51