Science, Tech, Math › Science Magic Colored Milk Science Project Share Flipboard Email Print All you need is milk, food coloring, and detergent to make a wheel of color. Trish Gant / Getty Images Science Chemistry Activities for Kids Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated August 27, 2018 If you add food coloring to milk, not a whole lot happens, but it only takes one simple ingredient to turn the milk into a swirling color wheel. Here is what you do. Magic Milk Materials 2% or whole milkfood coloringdishwashing liquidcotton swabplate Magic Milk Instructions Pour enough milk onto a plate to cover the bottom.Drop food coloring into the milk. Dip a cotton swab in dishwashing detergent liquid.Touch the coated swab to the milk in the center of the plate.Don't stir the milk; it isn't necessary. The colors will swirl on their own as soon as the detergent contacts the liquid. How the Color Wheel Works Milk consists of a lot of different types of molecules, including fat, protein, sugars, vitamins, and minerals. If you had just touched a clean cotton swab to the milk (try it!), not much would have happened. The cotton is absorbent, so you would have created a current in the milk, but you wouldn't have seen anything especially dramatic happen. When you introduce detergent to the milk, several things happen at once. The detergent lowers the surface tension of the liquid so that the food coloring is free to flow throughout the milk. The detergent reacts with the protein in the milk, altering the shape of those molecules and setting them in motion. The reaction between the detergent and the fat forms micelles, which is how detergent helps to lift grease off of dirty dishes. As the micelles form, the pigments in the food coloring get pushed around. Eventually, equilibrium is reached, but the swirling of the colors continues for quite a while before stopping.