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Milk is rich in vitamins and minerals, in addition to protein, good fats, and carbohydrates. However, drinking spoiled milk will give you an upset stomach. The expiration date on the box will tell you if the milk is still good to use, but there are many factors that can cause the milk to go bad before it expires. By testing the smell, consistency, color, testing with heat or reacting with baking soda, you will know if the milk has gone bad. [1] X Research Source
Steps
Milk test
- The shelf life of milk depends on the fat and lactose content of the milk. Full cream milk can still be used after the expiration date 5 days, and milk without lactose or fat can be used up to 10 days after the expiration date.
- If the milk has expired more than a week ago, you should still throw it away even though the color and smell are normal.
- Even if the milk looks fine but has an unusual smell, it is best not to drink it anymore.
- If you can’t determine if the milk has an unusual smell, you can ask someone else to help you smell it, or use another way to check and test the milk to be sure.
- Broken milk will be curdled. You may need to stir the milk well to check, as the milk tends to clump at the bottom of the container.
- You can also check the inside of the box. If there is residue in the can, the milk is spoiled.
- If it is difficult to determine the color of the milk, you can put a white sheet of paper behind or next to the milk cup for comparison. Spoiled milk will be slightly yellow in color.
- If you live with family or have roommates, it will be difficult to determine if the milk has been left outside, ask people to be sure.
Use the microwave to know if the milk is spoiled or not
- Just take a little milk to try, you can use the rest if the milk hasn’t gone bad.
- If you’re not sure how long it takes to warm the milk, start with 30 seconds. After 30 seconds and the milk is still not hot, you will reheat for another 30 seconds.
- The curdled milk is due to the high acidity that causes the protein in the milk to stick.
- When milk is warmed, it is normal to have a thin layer of scum on the top of the cup. That’s not a sign of spoiled milk. However, milk is only good if you see the remaining milk in liquid form after removing the scum.
Test for acidity in milk
- In general, you should not use expired baking soda to test milk.
- Milk looks or smells fine, but if the baking soda bubbles, you shouldn’t drink it.
Extend the shelf life of milk
- Keeping the milk in the refrigerator will ensure that the milk is always kept cold. Milk stored in the door compartment of the refrigerator will often be subject to temperature changes when you open and close the refrigerator, which will reduce the life of the milk.
- If you store milk in a clear bottle or cup, place it deep in the refrigerator and keep other foods out to reduce exposure to light.
- If the original carton is damaged, pour the milk into a jar or bottle with a lid. Do not store milk in an empty bottle or cup, even in the refrigerator, and then write the milk’s expiration date on a new container.
- If the lid is loose, you can use a piece of plastic bag or wax paper to wrap tightly to make sure the lid is as tight as possible.
- When defrosting milk, you can place the milk in the refrigerator or immerse the milk jug/box in cool water. [17] X Trusted Source Dairy Council of California Go to source
- When frozen, the consistency and color of the milk will change slightly. Even the milk will have the same consistency and color as when spoiled, but you can still use it. The taste of milk may also be less delicious.
Advice
- Milk that has been sour can still be used to cook or prepare dishes that require yogurt. [18] X Research Sources
- Dairy products that are not of animal origin, such as almond milk, may separate during storage. This is completely natural, you just need to shake well before use. If the milk is still not evenly mixed after shaking, the milk may be spoiled. [19] X Research Source
- Some old-fashioned fermented milks contain a bit of butter crumbs inside, don’t confuse these with curdling when spoiled.
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 28,929 times.
Milk is rich in vitamins and minerals, in addition to protein, good fats, and carbohydrates. However, drinking spoiled milk will give you an upset stomach. The expiration date on the box will tell you if the milk is still good to use, but there are many factors that can cause the milk to go bad before it expires. By testing the smell, consistency, color, testing with heat or reacting with baking soda, you will know if the milk has gone bad. [1] X Research Source
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