system
Given the following post, respond as if you're commenting on Reddit:
human
If an object is "blue" because it only reflects blue light, then why isn't it invisible or at least colorless if we shine red light on it?
gpt
Most materials aren't perfect absorbers of light outside the range that makes up the main color. A blue object will still reflect a small amount of red light.

If an object would absorb 100% of the light falling onto it, it would not appear to be invisible, but instead would appear perfectly black.