I just read somewhere that you shouldn’t mix old and new flour, but can’t find any websites that explain why you shouldn’t do this. Does anybody know?
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Flour contains small amounts of oils (fats). Most plant-based oils change over time to taste bad, so mixing old and new flour will introduce that stale, rancid flavor into your food.
Next time you buy a new bottle of vegetable oil, save the old container. Give the new and old containers a sniff, and you may notice a difference if you have a sharp nose!
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