Did you know you can make homemade glue from milk? All you need is milk, white vinegar and baking soda. The vinegar is used to split milk into curds and whey.
This fun kitchen science experiment is very simple, but does require a bit of adult help to heat the milk.
How to make glue from milk
What you need:
Make glue from milk
First you need to split the milk into curds and whey.
- 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 can be moulded to make a ball. These are the curds.
- 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 leave to 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!!!
How can you make homemade glue from milk? Why does it work?
Here’s what happened to the milk. The vinegar creates a chemical reaction which makes the milk 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 you 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.
More science experiments using milk
Learn about emulsions with a colourful milk display made with milk and dish soap.
Last Updated on April 1, 2022 by Emma Vanstone