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How to Identify spoiled milk

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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]

Milk test

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Image titled Tell if Milk is Bad Step 5

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Make sure the milk has an expiration date of no more than 7 days. If stored properly, milk that has not expired for more than 7 days can still be used. However, if it has expired and is kept at room temperature, there is a high chance that the milk has gone bad. [2]

  • 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.
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Image titled Tell if Milk is Bad Step 1

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Smell the milk for an unusual odor. Sniffing with the nose is the first and most obvious way to know if the milk has gone bad. Fresh milk usually has no smell, on the contrary, spoiled milk will have an unpleasant smell. If you have just smelled milk and you have to leave it, the milk is spoiled. [3]

  • 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.
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Image titled Tell if Milk is Bad Step 2

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Check the consistency to see if the milk is curdled. Fresh milk is liquid and smooth. The consistency of milk depends on the fat content. Whole milk will be thicker than skim milk. However, no matter what type, when pouring milk, you must feel the smooth consistency. [4]

  • 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.
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Image titled Tell if Milk is Bad Step 3

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Check if the milk is yellow or cloudy. Pour the milk into a clear glass and shine it under the light. Good milk will be clear, clean and white in color. Damaged milk will often be cloudy or yellow. [5]

  • 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.
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Image titled Tell if Milk is Bad Step 4

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Determine if the milk has been left at room temperature. Milk needs to be refrigerated to maintain quality. If left at room temperature for a long time, the milk will spoil – whether or not the shelf life is long. Milk left at room temperature for more than an hour will most likely spoil. [6]

  • 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

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Image titled Tell if Milk is Bad Step 6

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Pour the milk into a microwaveable cup. If you’ve checked, but you’re still not sure if it’s spoiled, you can try again this way. You will pour some milk into a clear glass about 2.5 cm high. [7]

  • Just take a little milk to try, you can use the rest if the milk hasn’t gone bad.
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Image titled Tell if Milk is Bad Step 7

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Put the milk in the microwave for about 30-60 seconds. The time may be shorter if you use a larger microwave with a higher power. [8]

  • 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.
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Image titled Tell if Milk is Bad Step 8

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Throw away any milk that has curdled or stuck. Shake the cup of warm milk to see if the milk is still liquid or begins to thicken. Milk is spoiled if it becomes lumpy or sticky after reheating. [9]

  • 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.
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Test for acidity in milk

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Image titled Tell if Milk is Bad Step 9

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Pour a teaspoon of baking soda (10 g) into a plate. You don’t need a lot of baking soda to try it out – just enough to see how the baking soda reacts with the milk. Make sure the baking soda is fresh, if it’s been left too long, the reaction may not be correct. [10]

  • In general, you should not use expired baking soda to test milk.
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Image titled Tell if Milk is Bad Step 10

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Add a few drops of milk to the baking soda. You should always use milk in the box instead of previously reheated milk. Just a drop or two to see the reaction with baking soda is enough. [11]
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Image titled Tell if Milk is Bad Step 11

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The spoiled milk will cause the salt to bubble. Baking soda doesn’t react with milk and it’s fine. Spoiled milk has a higher concentration of acid, so when it reacts with baking soda, CO2 bubbles are produced. The more bubbles, the higher the acidity in the milk. If no bubbles appear, the milk is safe to use. [12]

  • Milk looks or smells fine, but if the baking soda bubbles, you shouldn’t drink it.

Extend the shelf life of milk

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Image titled Tell if Milk is Bad Step 12

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Store milk below 4°C. Milk should always be kept in the refrigerator, milk left at room temperature for a long time will spoil faster. [13]

  • 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.
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Image titled Tell if Milk is Bad Step 13

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Avoid exposing milk to light. Milk in clear glass or plastic cups won’t last as long as milk in colored cardboard or plastic cups. Milk will spoil when exposed to light, even for a short time when you open and close the refrigerator door, the shelf life of milk will also be reduced. [14]

  • 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.
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Image titled Tell if Milk is Bad Step 14

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Tighten the lid of the milk carton. Fresh milk exposed to air can spoil even if it is stored well. Make sure to tighten the lid of the milk carton after use, and keep the milk in the manufacturer’s box, which is specifically designed to preserve milk. [15]

  • 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.
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    Image titled Tell if Milk is Bad Step 15

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    The last option is to freeze the milk. You can keep milk for up to 3 months in the freezer. If you live alone and do not drink milk regularly, this is an economical way to avoid wasting milk. [16]

    • When defrosting milk, you can place the milk in the refrigerator or immerse the milk jug/box in cool water. [17]
    • 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]
    • 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]
    • Some old-fashioned fermented milks contain a bit of butter crumbs inside, don’t confuse these with curdling when spoiled.

    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]

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