Tomato purée is a kitchen staple, but once opened, it won’t stay fresh forever. Even when it looks normal, it can collect bacteria or spoil during storage. Watch for visible mold, unusual sour or rotten smells, unexpected bubbling, or major changes in texture and color. If you spot fuzzy white, green, or blue patches, throw away the entire container rather than scraping off the mold. Never taste questionable purée to check whether it’s safe.

Another warning sign is unexpected gas or fermentation. Bubbling, foaming, swollen lids, or bulging cans may indicate a problem. Also inspect the packaging for leaks, broken seals, deep dents, or damaged areas. Some liquid separation or slight surface darkening can happen naturally, so these changes alone don’t always mean spoilage. However, if they appear alongside other warning signs, it’s safest to discard the product.

Once opened, commercial tomato purée should generally be refrigerated promptly and used within 5–7 days, unless the manufacturer’s instructions recommend a shorter period. Keep it covered at 40°F (4°C) or below, use clean utensils, and freeze leftover portions if you won’t use them soon. Homemade purée may have a different storage life, depending on preparation and handling. Remember, a normal smell and appearance cannot guarantee safety, especially if the purée has been stored too long.

Cooking spoiled tomato purée won’t necessarily make it safe, because heating may not destroy toxins produced by certain microorganisms. If you’re unsure how long it has been open, it was left unrefrigerated too long, or the packaging is damaged, don’t take the risk. A fresh container is a much safer choice than risking foodborne illness. 🥫