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  • Marginal gains I'm sure, but does it matter if ground coffee is kept in a clear glass jar on the countertop as opposed to in an opaque bag in a dark cupboard?

  • I'd agree with the points that @youClown made, but really the only way is to do a proper test.

    Maybe split the bag into bag & jar, and either have one of each each day, or alternate on which you use each day?

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