Asked by Karma

Evil is represented by the black knight in this story. Do you think evil is to be necessarily represented by 'black'?
PsyDAG
Probably not, but the night is perceived to be full of unseen danger, so black (or lack of light) is commonly used as dangerous or evil.
I don't think because the colors doesn't shows the appearance of the knight, it only change their looks from outside not of inside.