Abstract art with milk
Objective: The objective of this practice is to see how an abstract drawing can be made on a canvas of milk
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Laboratory materials:
Plastic dish
Cotton swabs
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Reagents:
Milk
Dish soap
Food coloring
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Qüestions:
Which physical property is involved in the experiment?
Procedure
- Add milk to a deep plate.
- Add different food coloring to it (three drops in different parts is enough).
- Dip the cotton swab in the dishwasher and touch the surface of the milk.
- Observe what happens.
Theoretical explanation
In this experiment, the milk canvas does not allow the food coloring to spread quickly because milk, besides water, also contains proteins, fats, and other components that cause the colors to remain concentrated.
When soap touches the milk surface, the colors separate quickly because the surface tension of water is broken. Surface tension is a property of liquids that causes the surface layer to behave like a skin, as water molecules attract each other and exert tension.
Did you know…? Surface tension is what makes liquid droplets spherical and it also allows pond skater to float on the water.”
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