system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does all Soap and Shampoo turn into a white foam regardless of color?
gpt
Top answer from a google.

Answer: Foam is made out of millions of very small bubbles. The light on the inside of them is much darker than the outside, so they all act like miniature mirrors. Because the light you usually look at foam in is white, you get a white reflection.