All Quinnoa articles in one place.
Light surface rust that wipes off can be cosmetic, but heavy rust, pitting, holes, seam damage, leaks, or rust inside the opened can are reasons to discard the food.
A small shallow dent away from seams may be cosmetic, but deep dents, sharp creases, or damage on the top, bottom, or side seam can break the seal and are reasons to discard the can.
Sugar crystals in jam usually come from excess or incompletely dissolved sugar or from overcooking and are a quality defect, not spoilage by themselves; mold, fermentation, or moving bubbles are different warning signs.
Water separating from tomato sauce can result from natural tomato enzymes, water-rich varieties, or freeze-thaw changes and is often a quality issue; gas, mold, bad odor, or a swollen package are different problems.
Black or gray spots on tempeh are often normal Rhizopus spores from fermentation; unusual colors, slime, mushiness, or a strongly unpleasant odor point to a different problem.
A thin layer of oil or watery liquid can separate from hummus during storage and may be stirred back in, but refrigeration history, mold, gas, slime, and off odor matter more than separation alone.
Oil separation is normal in many natural peanut butters because they lack strong stabilizers; stir it back in unless the spread shows rancid odor, mold, contamination, or package damage.
Live insects, larvae, webbing, exit holes, or unexplained powder in nuts indicate a pantry-pest infestation; discard the affected package and inspect nearby dry foods rather than treating only the visible nuts.
Spoiled tofu commonly develops a strong sour smell and slimy surface; mold, gas, abnormal colors, or poor refrigeration are additional reasons to discard it.
Soft cereal often reflects absorbed humidity and a loss of quality; mold, rancid odor, wet clumps, stains, or insects indicate spoilage or infestation.
Salt usually cakes because it absorbs humidity and can still be used; dirt, insects, mold on contamination, or unusual odor are different problems.
Spontaneous bubbles, pressure, sour odor, slime, or increasing foam in refrigerated cooked legumes can signal fermentation or spoilage and call for disposal.