Magic sand, also known as aqua sand, remains dry when placed in water. It is essentially sand that has been coated with a hydrophobic substance. Hydrophobic substances repel water, keeping the sand dry. Use magic sand to explain the concepts of hydrophobia and hydrophilia to a group of students or simply use it to encourage them to experiment and observe.
Things You'll Need
- Shallow box
- Fine sand
- Silicone spray
Cover the interior of a shallow box with a large piece of newspaper, making sure that the bottom of the box is entirely covered.
Spread a thin layer of fine sand in the shallow box.
Spray the layer of sand with a thick coating of silicone spray. Scotchgard protector, which is used to protect fabric, is one example of a suitable silicone spray.
Shake the box to cover the sand thoroughly with silicone.
Repeat Steps 3 and 4.
Allow the sand to sit overnight.
Test the sand by picking up a handful and dunking it in water. If the sand is properly waterproofed, it will remain in a clump in your hand. If it starts to dissipate, repeat the process of spraying it and allowing it to dry.
Tips & Warnings
- Reuse magic sand by pouring it on paper towels to dry and then storing it in small resealable bags.