system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If "black" is the absence of all colour, why is the outcome colour "black" when I mix a bunch of colours of paint together?
gpt
Paints color is based on what light they absorb. So red paint absorbs all colors but red, the red light bounces away from the paint and hits your eyes.

So mix a bunch of paint together and you end up with a mix that absorbs a little bit of everything, and the result is black.