What happens to the food coloring after placing container above other container?

Please provide more context! I need to know what you're referring to in order to answer your question.

For example:

* What are the containers made of? (glass, plastic, etc.)

* What is in the bottom container? (water, oil, etc.)

* What kind of food coloring is it? (liquid, gel, etc.)

Once you provide more details, I can help you understand what happens to the food coloring.