Build a rainbow density tower with just water plus one special ingredient…salt! (Or, swap salt with sugar to make a sugar density rainbow!) Learn how to do this colorful classroom science experiment below 👇 Tinker, create, and innovate with more hands-on discovery from kiwico.com/YTShorts What you need: Salt Water Food coloring Measuring cup Teaspoon 5 plastic cups 1 tall, narrow glass (we used a graduated cylinder) Pipette How to build a rainbow in a glass: 1. Start with ½ cup of five different colors of water: red, orange, yellow, green, and blue. 2. Add ½ tsp of salt to the orange, 1 tsp of salt to the yellow, 1 ½ tsp salt to the green, and 2 tsp salt to the blue. Make sure to add no salt to the red. 3. Add the blue water to your container. We used a graduated cylinder and added 5 mL of each color. 4. Using a pipette, gradually add the green water, then yellow, orange, and red. What’s going on? Salt makes water more dense, and it will stay at the bottom of the container because...