Snowflakes reflect light like a mirror to create their white color.
Liquid water is clear, but snow is white. Why is that?
Well, the snow crystals have many surfaces at different angles and each one of these surfaces acts like a tiny mirror which bounces back the light. So, the white color you are seeing is actually the light that is being reflected. The light bouncing off the surfaces contains all the colors of the rainbow combined together, to make white light. This white light lands on a snow crystal’s surface and then reflects back off, like a flashlight beam on a mirror.
This act of bouncing light is what scientists would call scattering. The surface of the snowflake scatters light in many directions, causing us to see the white color. In an earlier podcast, we learned why snow has six sides. Snow is a crystal, with facets just like a diamond. Each one of these facets bounces light back to give it the color we see.
Now, snow is not the only thing that bounces light back. Water droplets can scatter light back too. This is why clouds, steam, and fog look white.
So, the colors you see, well, they are just the surface.