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In this activity, learners experiment with how dish soap and fat interact by making a colorful swirl. The soap disrupts the surface tension of milk, producing the swirling colorful patterns of the dissolved food coloring. Activity includes step-by-step instructions with photos, a section that explains the science behind the activity, and suggested discussion and extension questions. A helpful how-to video is also provided.
- Under 5 minutes
- 10 to 30 minutes
- $1 - $5 per student
- Ages 6 - 14
Materials List (per student)
- Whole milk or 2% milk- the higher the fat content the better.
- Plastic tray - or any surface to put a thin layer of milk on
- Food coloring (preferably in dropper bottles)
- Cotton swabs /cotton buds
- Dish soap /washing-up liquid
- Food and Cooking