Plastic Milk!

‘Little Miss Muffet Sat on her Tuffet Eating her Curds and Whey”

But what are curds? This experiment lets us milk turn into into a solid and make plastic milk so we shall find out!

To make plastic milk you will need:

•skimmed milk
•white vinegar
•microwave proof bowl


Make plastic milk


  • 1. Add 4 teaspoons of white vinegar to one and half cups of skimmed milk.
  • 2.Microwave the mixture for about a minute/ or heat over a stove to warm.
  • 3. After a minute, the milk and vinegar will be separated into a liquid part (the whey) and the solid part (the curd)
  • 4. Now, when you stir the milk, the solids become a “blobs.”
  • 5. Strain the liquid off, you squeeze the blobs into one big lump. Squeeze out all the left over liquid.

Make plastic milk


Make plastic milk


  • 6. Let it cool off, and then you can play with it. It feels like rubber.

Make plastic milk

  • You can form the blob into shapes. If you leave it out, it will harden.

The Science bit

Here’s what happened to the milk. By adding the vinegar, you have created a chemical reaction which caused the milk to separate into two parts, a solid-the curds-and a liquid-the whey.The protein in the curds is what makes it act like rubber. A really simple experiment that gives you something very touchy and feely to do. It also makes a great sensory tool for little ones to play with.

Have fun and let us know if you try to make plastic milk.

There are 14 comments

  1. maggy,red ted art

    If you add enough vinegar, could you make something that won’t go off – i.e. could this be a new “type of playdough” could you make something with it? I have random thoughts, you don’t really have to answer that.

    Thank you for joining Kids Get Crafty!


  2. How to make plastic milk

    […] Plastic milk was one of the first experiments I posted on Science Sparks, when the kids were quite little.  It was a lovely sensory experience for them at the time, but they obviously couldn’t understand what was happening, with that in mind we revisited the activity with the addition of some food colouring. You can find the full instructions for how to make plastic milk here. […]

  3. Renu

    Hi. I love you site.

    The Plastic milk that you have made is also known as paneer. Its a sort of cheese used in Indian cooking especially in the northern regions. We use lemon juice or vinegar to separate the milk. Its then, kept in a cheese cloth and hung, of which the whey drains out and the end product is allowed to become firm.

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