This is what happens when you mix Coke and milk. I don’t know if I’ll ever drink Coke again… WTF?

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If you are still amazed by the Coke+Mentos reaction, wait until you see what happens when you pour some milk into a bottle of Coke.

Coke has an acidic pH between 2.5 and 4.5, and most of you probably know that you can use Coke to take tarnish off of coins and other metal stuff, and some people even use it to degrease car engines. But what happens when we mix Coke with another liquid with a normal pH like milk?

Take a look at the images below, you will find a brief explanation at the end of the post.

Now let’s see what happens when you pour some milk into a bottle of Coke


Close the bottle and forget about if for 6 hours


Here is what the Coke will look like after 6 hours:


Here’s a close up of the top…


… and this is the bottom. It looks like dirty water and sand. Pretty impressive…


Here is the entire process:

Long story short, what basically happens when you mix Coke and milk is a reaction of the Phosphoric Acid contained in the Coke with the milk. Phosphoric Acid molecules attach to the milk giving them more density, this separes these molecules from the rest, while the remaining liquid that makes up milk and Coke becomes lighter and floats on top.

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  1. Well coke IS acidic with other things in it and milk is alkaline, so the acid in the coke just mixes to form water and salt, and the other unreacted elements just sink to the bottom. :I It’s nothing to be disgusted about xD

  2. in indonesian, we called it a soda gembira or milky cold cola. we mix it with milk and ice cubes. i guarantee, the taste is so good. 🙂

    • Yes this expermient seems to be afake cause i have milk and coke everyday and leave it some times for hours either in freezer or outside before having it it still looks choclate coloured milk.

  3. I think drinking too much coke is dangerous for our health. it countain a lot of sugar and offcourse less nutrition.. but i agree with hadi that soda gembira taste delicious but u can’t drink it too much 🙂

  4. i tried and it didn’t work although i tried it with very little coke, does it have to be in a bottle? pls help i wanna prove this to a friend

  5. And? Whats your point? Dont let it sit that long. I drink it all the time when fresh made tastes like a yummy melted coke float!

  6. My family used to mix this up as a treat, like a makeshift ice cream soda. It actually tastest pretty good!

    Of course it becomes less appetizing after sitting out for 6 hours. What on Earth do you leave out for six hours and then eat or drink?

  7. This is ridiculous. You realize that the acid in your stomach you use to digest food does this exact same thing to milk. The same thing would happen if you added milk to lemonade or orange juice.

    The reason the residue is dark is because the milk proteins bind to the caramel coloring in the Coke. The reason they collect at the bottom is because the extracted proteins and sugars are heavier than the liquid they are in.

    If you looked in your stomach after you ate anything

  8. This is junk. This is a property of casein. Casein is a protein found in dairy products. Casein precipitates at a pH of 4.6. Anything acidic enough will do this including lemon juice, vinegar and your own stomach acid.

  9. This is BS, maybe if you leave it in there for a couple of days, That would happen, But never within a few hours. My grand father made me this drink as child using real fresh milk straight from the cow, He called it a Brown Cow. 🙂

  10. Is this harmful to drink?… There is a restaurant here which mixes milk and cola throughly, the mixture formed is really tasty.

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