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Food safety experts generally recommend storing butter in the refrigerator to ensure its longevity and safety. However, they acknowledge that butter can be left out for short periods, typically up to a few days, depending on the conditions. Experts advise against consuming butter that has been left out for a week, especially if it shows signs of spoilage, such as an off smell or mold growth.

To ensure butter remains safe to use, store it in the refrigerator and only take out the amount needed for immediate use. If you prefer to keep butter at room temperature for easier spreading, consider using a butter bell or crock, which can help maintain its freshness. Always cover butter to protect it from air and contaminants.

If you’re unsure about the safety of butter left out for a week, it’s best to err on the side of caution and not use it for baking. Instead, consider using fresh butter or a suitable substitute, such as margarine or a plant-based spread. These alternatives can provide similar results in your recipes without the risk of spoilage.

When it comes to butter left out for a week, safety should be your top priority. While butter can remain stable at room temperature for a short period, a week is generally too long, especially in warmer conditions. By understanding the factors that affect butter’s shelf life and following safe storage practices, you can ensure that your baking endeavors are both delicious and safe.