Corn starch and water have a strange property: it hardens when hit quickly, but not when hit slowly. Mix corn starch and water in a ratio of approximately 3:2 by weight, increasing or decreasing the amount of water as appropriate.
How to demonstrate
1. Pour about 5mL of this product into the palm of your hand and rub your hands together to form a solid ball in the form of a pellet, after stopping rubbing for about half a second the ball will quickly "melt" and return to a liquid state.
2. Place approximately 50-100mL of the product in a paper cup. Use a paper cup or plastic cup for light weight and easy handling.
3. Place approximately 50-100mL of the product in a paper cup, gently tilt the cup to show the participant the product in its liquid state, then turn the cup upside down but shake it up and down rapidly for a short distance before returning it to its rightful position.
4. Several litres of product were placed in a large shallow basin and participants were able to run quickly through the product in the shallow basin without sinking, but if they walked more slowly they sank into the product.
5. 50-100mL of product is placed on a vibrating membrane of an acoustic speaker facing upwards and the low frequency sound waves are turned on at a certain volume and the twisting and shaping of the product can be observed.