Making Plastic from Milk and Vinegar

We just made some plastic out of milk and vinegar. You can make all sorts of things with your milk plastic. We made a hole in ours so we can hang it up after it dries.

MaterialsMaking Plastic from Milk and Vinegar (8)

Measuring Cup



White Vinegar

Parchment Paper

Stove-top & Pan OR Microwave & Bowl

Safety Goggles

Fine strainer (You could probably sub in some paper towel and a strainer)

Optional: Food Coloring, Cookie Cuters, Straw (if you want to make a hole for hanging)


**Adult use for oven and microwave.**

  1. Heat 1 cup of milk until warm, then turn off heat if using a stove.Making Plastic from Milk and Vinegar (11)
  2. Add 1 Tablespoon of white vinegar. Gently mix around until it is stringy and lumpy.
  3. Drain the mixture with a fine strainer. Try to get as much of the liquid out as you can, I just gently rocked the strainer back and forth until the water wasn’t dripping out anymore.
  4. If you would like to dye the “plastic” put it in a bowl, add 5 drops of food coloring, and mix until evenly distributed.
  5. Place on parchment paper and make your design. Some ideas for your plastic: you could make beads, ornaments, key chains, or shapes. Allow to dry fully.

Talking Points

Acids have a pH of less then 7 or neutral. Acids have usually have sour taste.  Bases have a pH greater then 7, then tend to have a bitter taste. When you combine an acid and a base a chemical reaction or chemical change occurs. In a chemical reaction the change can not be undone.

Vinegar is an acid. Milk is a base. The acid from the vinegar causes the protein strands in the milk to group together or coagulate. When you drain off the clear leftover liquid and shape the coagulated lumps then dry it out it forms a plastic material. Plastic is synthetic (man made) material that can be molded into shape when soft and then sets into a solid or slightly elastic form.


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