- How does plasma make a campfire flame orange?
- Is human blood ever any color other than red?
- What is the color of the sun?
- Why are the microwaves in a microwave oven tuned to water?
- Why are there only six fundamental colors: red, orange, yellow, green, blue, and violet?
- Why does a rainbow contain a pure spread of spectral colors?
- Why was color invented by humans?