Technical knowledge
Staling is not spoilage.
Bread reaches the end of its life while it is still safe to eat. The starch that gelatinised in the oven recrystallises on the shelf, the crumb firms, and the loaf is rejected on texture long before microbiology has anything to say.
Shelf life is two problems, not one. A mould inhibitor extends the date on the pack and does nothing for the loaf the customer opens.
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