Make glue from milk

We have looked at making ‘plastic milk‘ before. This week we’re taking it one step further to make glue from milk.

  How to make glue from milk

How to make glue from milk

What you need:

  1. Milk
  2. White vinegar
  3. Baking soda
  4. Pan
  5. Water
  6. Strainer


  • Heat 1 and a half cups of milk in a pan, once warm add 3 teaspoons of white vinegar.
  • Keep heating and stirring the mixture and you should see the curds ( solid part ) and whey ( liquid part ) separate.

  • Strain the mixture using a sieve. You should be left with solid lumps which you can mould together to make a ball. These are the curds.

How to make glue from milk

  • Place the solid mixture back in the pan and add a little water and a tablespoon of baking soda.

  • Heat the mixture until it starts to bubble.
  • Give it a good stir and let it cool. You can now use it as glue. You might need to add a little more water or baking soda until you get the right consistency. It should look like a thick paste.
  • I tested ours by sticking two egg boxes together ( both contain eggs, so are heavy ). It worked!!!


Stick egg boxes with glue

The Science bit
Here’s what happened to the milk. By adding the vinegar, you create a chemical reaction which makes the milk to separate into two parts, a solid (the curds), and a liquid (the whey). The curds are milk protein, called casein. Liquid casein is a natural glue.

When we add the baking soda it neutralises the vinegar ( which is acidic ). The bubbles are caused by Carbon dioxide gas being given off as part of the reaction. The curds form a liquid again after being neutralised.

There are 33 comments

  1. Mammozza

    It’s very interesting. I have this idea in my mind but I haven’t realize it yet. Every sunday we do a scientific experimet and maybe one of the next sunday we will make it.
    Greetings from Ital

  2. dawn

    This is awesome. Going to do this tomorrow. Then I’ll take it a next step. My daughter wants to know if add in borax would have the same effect on this glue as store glue.

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