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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When you mix old food with new food you make new food old.
Over time, bacteria and fungus grows on food. Mixing old food that has had time for this stuff to grow on it with now food just spreads that stuff on the new stuff. It makes it spoil faster, and it makes the risk of getting sick from it bigger.
Flour’s a not-so-obvious problem because we let it sit on the shelf a long time so we tend to not think about it spoiling or stuff growing on it.
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