We used cornflour, water and food colouring to make gloop. The ooze is made up of tiny, solid particles of corn flour suspended in water. This type of mixture is called a colloid. It behaves strangely!! If you stir a cup of tea with a spoon, the tea moves out of the way easily, no matter whether you stir it quickly or slowly. But the colloid will resist the movement if you stir it quickly.