Posted in Science

How to make milk stone

If you have been following us, you would have noticed that smarties love science experiments. This time round, we found a way to reuse/recycle fresh milk that has been expired for our project. Yes, even milk does not go to waste with this project.

With just 2 ingredients, we can make stones out of it. Some people called it plastic. Whatever it is, it was a fun and fulfilling experience for all of us.

Our 2 main ingredients are:
– milk
– vinegar

– strainer
– container
– spoon or anything that can use for stirring
– kitchen towel/paper
– cookie cutters

Step 1:
Warm the milk a little. Adult supervision and guidance are necessary at this part.

Step 2:
Pour 2 tablespoons of vinegar into the milk and mix it till you see chunks (casein) forming.

Step 3:
Strain the chunks out and further pat it dry using kitchen towel/paper.

Step 4:
Mold it into any shapes that you desire and wait for it to dry. The drying takes at least 2 days.Β Touch and feel it once it is dry.

What is happening here?
When you mix vinegar to the milk, a substance called CASEIN is formed. Casein occurs when the protein in the milk meets the acid in the vinegar. In other words, the acid in the vinegar separates the protein from the water hence forming the casein (or chunks).

Check out our video here for step by step guide on how to do it. Have fun!



I am a busy mummy of 2 wonderful kids. Their thirst for learning has made me busy researching and making learning resources/materials for them. Most of the time will be according to the topics that they have requested. Otherwise, I will randomly pick a topic and create the materials for them. Most of the time, the materials will include right brain training as well. From them, I get to learn a lot too! However, material preparation is quite a challenge! It will even be more challenging if you are a working parent! Here, I would love to share what we have done and hope busy parents out there will find our materials useful for their little one. If you have any queries/comments or if you have any topics that you would like to cover with your little one(s), do drop me a message and I will get back to you as soon as I can :) Our mission is to find, discover and reveal the fun of kids learning! Drop us a message if you are interested in any of our materials. Let's make learning fun!

13 thoughts on “How to make milk stone

  1. Your site has got so many activities to try out when my girls are older! Treasure site! And this one looks simple enough. Hope to find time to do together with them.


  2. This looks really fun! I think I might enjoy it as much as kids would. Although I am wondering by mixing milk and vinegar, will it have a funky smell? I am extremely afraid of dried milk smell.


  3. Oh, very nice…In Indian recipes, we call this as cottage cheese and use it for making sweets and vegetables in North Indian style.Your child very nicely showed it how to make.


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