What You Need:
- 3 empty food jars
- Skim milk
- Baking soda
- Paper towels
- Plastic funnel
- Coffee filter
- Stirring rod
- Measuring cup and spoons
What You Do:
- Pour roughly 1 cup of skim milk into one of the jars
- Add 1 tablespoon of vinegar to the milk.
- Stir the mixture (for better results heat the mixture in a pot slowly) and allow to it sit until you observe separation into two cheese-like layers.
- Place the funnel in one of the empty jars and insert the coffee filter.
- Filter the milk/vinegar mixture by pouring the liquid through the coffee filter.
- Once the liquid has drained, scrape the solid residue from the filter.
- Use paper towels to dry the solid as much as you can, and return the solid to a clean jar.
- Add a small amount of baking soda to the solid.
- Mix and test the resulting glue by gluing two pop-sickle sticks or pieces of paper together.
How does it work? Adding vinegar to milk produces a solution that separates into two substances: the white substance is called curds and the liquid is called whey. When filtering the milk the curds are separated out which can be dried with a paper towel to produce a cheese-like substance. The baking soda, when added to the curds, causes them to become sticky glue.