材料：颜料，水，油，蜂蜜，冰块，盐, 透明的杯子，直径不要太大。
步骤：以前做过的鸡蛋的实验，现在猜猜honey will sink or float in the water? How about the ice?
1. pour the oil first then water, shake it to observe then wait for a while to see the oil is not in the bottom but float to the top
2. pour some honey, then water and oil. we can also add some colorful ice block to see where will these ice blocks stay. it makes kind of sandwith.
3. Mix the water with different colors as the colors in a rainbow. Add 0, 1, 2,3,4,5,6,7 spoonful salts to each of the colorful water. pour the one with 7 spoonfuls salts, then 6, 5, 4, 3, 2, 1. Pay attention to pour slowly and we will see a rainbow in the bottle.
