One experiment using milk and food coloring involves creating a plate of milk that rapidly changes colors when combined with dish soap. The results vary depending on the type of milk used.
To create this experiment, fill and labels four bowls, each with a different type of milk: whole, 2 percent, 1 percent and skim. A hypothesis is written regarding how the four types of milk will interact with the food coloring and dish soap. Then, a few drops of food coloring are squeezed into the center of each bowl. After 30 seconds, two drops of dish soap are squeezed into the center of each bowl. The observations are written down.
The results are different for each type of milk. The milk that has the highest amount of fat causes the food coloring to move around, but the lower fat content milk will cause the food coloring to move slower or hardly at all. This is because the dish soap bonds with fat, and the water and food coloring are pushed away by the strength of the bond.
It's also possible to try this experiment with other types of milk and liquid, such as soy milk or coconut milk to see what happens. When adding different colors of food coloring, a tie-dye swirling effect can occur.