Plastic Milk for Mad Scientist Monday

This is a really cool experiment I found from Science Bob's website. I haven't actually tried it yet, but I'm going to.  It's not really plastic that's made. It's actually CASEIN that's formed when the protein in milk meets with the vinegar.

1. 1 cup of milk
2. 4 tsp. white vinegar
3. pot for heating
4. strainer
5. bowl
6. spoon

1. Heat the milk until it's hot (not boiling)
2. Pour the hot milk into a bowl.
3. Stir in the vinegar for about a minute.

Google source
You can see the casein starting to form in the pic above.

4. Pour the milk through the strainer into a sink.
5. You'll be left with lots of goopy white lumps in the strainer.

Google source

6. Rinse the blobs in cool water.
7. When it's cool enough to handle you can press the blogs together and mold them into cool shapes!

Google source
 8. The moulded shapes take a couple of days to harden and they can also be painted.

Google source

As you know, I also like to do whole class hypotheses before beginning and I like to glue the kids' predictions on chart paper. For this experiment I would give everyone a paper milk carton to colour and put their name on. Each child would then glue theirs above the appropriate hypothesis.

Have fun!


  1. How fun! I am coming to your science class!

    Chickadee Jubilee

    1. We could have fun doing nothing but science experiments all day :)

  2. This just looks so fun to do! You come up with a lot of great experiments!
    Conversations in Literacy

    1. I used to have a noon hour Mad Scientist Club and I was thinking this summer how much I missed it.

  3. Felix and I are set to do this on Wednesday. I will also be mailing you booties on Wednesday!! They are gorgeous.

    ✰ Kimberley ✰
    First in Maine

    1. You'll have to let me know how the experiment turns out!
      Oooh, I can hardly wait!

  4. Great blog and science experiment! Your newest follower,
    Flying Into First Grade

  5. What a cool experiment !! I can't wait to try it :)
    I'm your newest follower & would love for you to stop by !

    First Grade Fairytales


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