Milk Painting for Christmas

Milk Painting is a classic STEM activity, with household materials. For Christmas is around the corner, I made this special Christmas edition. I sure you must already have materials at hand to perform this science activity. Let's get started.

 Age:3+ Time: < 15mins


1. Do not drink the milk used in this experiment.

2. Be careful, not to break the tray.

 Materials list 

  • 100ml whole milk
  • Food coloring (red, green)
  • Dishwashing soap
  • Dropper
  • Tray (any container)


Step 1/3 – Pour the milk to the plate, about 5mm depth.

Milk Painting for Christmas Step 1

Step 2/3 – Add a few drops of red and green food coloring to the milk.

Milk Painting for Christmas Step 2

Step 3/3 – Load some washing soap in the dropper and drop them onto the food coloring. See what will happen.

Milk Painting for Christmas Step 3


Why does the food coloring dissolve quickly in milk?

- The food coloring used in this experiment can dissolve in water with ease so the lower the fat content in milk, the more food coloring will dissolve in water. Therefore, when skimmed milk or low-fat milk is used, the food coloring will dissolve quickly and fail to achieve the desired effect.

 Question to ask 

Can you use soy milk, coconut milk as well as goat milk to do this experiment?

What will happen if other kinds of liquid are used to replace the milk?

 Scientific description 

The principle behind is the Surface Tension Theory. The main ingredients of milk are water (mostly), protein, fat, vitamins and, etc. Because some proteins and fats in milk cannot dissolve so they remain droplets in the water. The dishwashing soap can significantly reduce the surface tension. When dishwashing soap is added to the milk, it reduces the surface tension of the water so the milk made by the protein and fat in the milk will flow, while the food coloring on the surface will flow with them too. Thus, the color is moving.


You can dip some washing soap on your finger and touch the food coloring with that finger so that it appears you have MAGIC power.

We also have some other Christmas activities for kids. Check out. 


Milk Painting for Christmas  Milk Painting for Christmas Reviewed by Ronyes Tech on December 13, 2020 Rating: 5


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