How do you make magic milk or color changing rainbow milk? Let us show you how easy and fun simple science experiments can be! The chemical reaction in this magic milk experiment is fun to watch and makes for great hands-on learning. The perfect kitchen science, as you already have all the items for it in your kitchen!
Magic Milk Science Experiment
💡 Make this a science experiment or even a milk science fair project using the scientific method. Choose one variable to change and write a hypothesis to test. You could repeat the experiment with different types of milk, such as skim milk, and observe the changes.
Materials Needed:
- Full Fat Milk
- Liquid Food Coloring
- Dawn Dish Soap
- Cotton Swabs
NOTE: There are so many fat percentages available that the milk used is a fantastic variable to consider! Low-Fat Milk, Skim Milk, 1%, 2%, Half and Half, Cream, Heavy Whipping Cream…
Magic Milk Experiment Set Up
Watch the video:
STEP 1: Pour your whole milk into a shallow dish or flat surface. You don’t need a lot of milk, just enough to cover the bottom and then some.
💡 If you have leftover milk, try our milk and vinegar plastic experiment!
STEP 2: Next, you want to fill the top of the milk with drops of food coloring! Use as many different colors as you like.
💡 Use a variety of colors or give your magic milk experiment a theme for the season or holiday! See how to set up this experiment for St Patrick’s Day, Valentine’s Day, winter and even Christmas!
STEP 3: Pour a small amount of dish soap into a separate bowl, and touch your cotton swab tip to the dish soap to coat it. Then, bring the soapy cotton swab to your milk dish and gently touch the surface of the milk with it!
💡 Try a cotton swab without dish soap first and see what happens. Talk about what is observed, then try the dish soap-soaked cotton swab and check out the difference. This is a great way to add more scientific thinking to the activity.
What happens? Make sure to read about how the magic milk experiment works below!
Remember, each time you try this magic milk experiment, it will look slightly different. It’s a fun fireworks science activity for the 4th of July or New Year!
Also, check out: Fireworks In A Jar Experiment
How Does The Magic Milk Experiment Work?
Milk is made up of minerals, proteins, and fats. Proteins and fats are susceptible to changes. When dish soap is added to the milk, the soap molecules run around and try to attach to the fat molecules in the milk.
This movement disrupts the surface tension of the milk and pushes the food coloring around. The food coloring looks like fireworks because it’s getting bumped around, causing a color explosion.
The soap breaks the surface tension of the milk. When the soap molecules head for the fats, they form spherical micelles. This causes movement and creates cool bursts and swirls of color. After all the fat molecules have been found and equilibrium has been reached, there is no more movement.
Are there any more fat molecules hiding? Try another cotton swab dipped in soap!
💡 For younger students: Ask them to describe what they see as the colors spread, noting how adding soap causes movement in the milk. Focus on cause and effect – “What happens when we add soap?” and using descriptive language.
Click here to get your free printable science guide!
Related Science Experiments
Here are some more fun experiments that explore surface tension and chemical reactions:
- Skittles Experiment: Arrange Skittles in a circle on a plate, add warm water, and watch the colors spread. The movement of color across the plate is similar to how soap moves food coloring in milk.
- Floating PaperClip: Carefully place a paperclip on the surface of a cup of water so it floats. Then add a drop of dish soap and observe how the paperclip sinks as the surface tension is broken.
- Pepper and Soap: Another way to show how soap breaks surface tension, similar to the Magic Milk experiment.
- Oil and Water: Use food coloring to observe how the oil and water don’t mix.
- Bubble Science: Use a bubble wand to blow bubbles and observe the colorful bubbles. This activity demonstrates how soap molecules stabilize bubbles by reducing surface tension.
- Drops on a Penny: Use a dropper to add drops of water to a penny until it overflows. Repeat with soapy water to see how soap affects surface tension.
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This activity is a staple in my house! 🙂 I wanted to say that, even though you say it’s great for little kids, my older kids (6 and ELEVEN) still love this, too!!! I’m not kidding- my eleven year old son asked to do magic milk last month. 🙂 Great fun!
Hi,
This looks like a terrific idea to do with my kindergarten class! However, is there a possible substitute I can use for the milk?
Interesting and funny experiments. I like fireworks activity. A ton of value in cheap science activities and experiments.
My son suggested swapping out the soap for sanitizer and it is awesome. The color just explodes!
The experiment was fun. We read the explanation about the soap attaching to the fat molecules. We tried it with fat free milk and the same result occurred. Why?
I things with my 4 year old grandson, and this was amazing, we did over and over and when his mom came home from work, he had to show her.
Thank you so much for sharing, as on a limited income your free things help me help him learn.
Sincerely, it was fun looking forward to the next experiment.
Awesome! So glad to hear he loved it that much!