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