Black and white is still one of the best medium of transferring information, because it doesn't have multiple colour and feature that will make the brain to interpret does information unconsciously, but when it comes to colour they are a lot of feature and colours that can even change your focus from the mean story
Just like reading a book and watching a movie,
Reading will make you focus on that particular story line, while watching the movie will divert your focus because of the graphics, and other features.