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Softness can come from humidity, but sticky, stringy bread with abnormal fruity odor or discoloration can indicate bacterial rope spoilage and should be discarded.
Discard flour with weevils or larvae, inspect nearby dry foods, and clean shelves and cracks; sifting out visible insects does not reliably remove an infestation.
Discard dry rice with insects, inspect nearby pantry foods, and clean containers and cracks; cooking or removing visible adults does not reliably eliminate an infestation.
Fine webbing, larvae, or insects inside dry pasta indicate a pantry pest problem; discard the package and inspect nearby dry foods.
Stale-oil, cardboard, paint, soapy, or old-nut odors can signal rancidity in oats; cooking does not reverse oxidation once the fats have deteriorated.
A little separated whey can be normal in ricotta, but strong sour odor, slime, mold, package swelling, or poor refrigeration are reasons to discard it.
Milky or cloudy albumen usually points to a very fresh egg; pink or green colors, off odor, or poor storage call for a different assessment.
A yolk that breaks easily often reflects a weaker membrane from age or a shell-edge puncture; by itself, it does not prove the egg is spoiled.
A sulfur smell can be normal in an overcooked hard-boiled egg; putrid odor, slime, mold, or poor refrigeration point to a different problem.
Smooth white specks are often chalazae or dense albumen, normal egg structures. Unusual colors, fuzz, or bad odor call for a different assessment.
Droplets can come from temperature changes, but persistent dampness, mold, unusual odor, or sticky bread are reasons to discard the affected package.
Dark yellow or translucent edges often come from oxidation, drying, or temperature changes; rancid odor, mold, or unusual stickiness are stronger reasons to discard butter.