Haki doesn't have a color. if you read the manga of One Piece you should know that its colorless
Seeing this black arm, the two-knife geek felt an extremely strong death crisis, and wanted to turn around and escape, but found that he had been locked by Lu Li's Qi machine and could not move at all.
Games · void_observer
Im pretty sure theres a book of this but i think they created an English version(this)
Catastrophe Card King
Games · Blindness