1. Why does kaneki have black hair again?
2. Why did Kanekis hair change?
3. Why is Haise’s hair turning black?

Why does kaneki have black hair again?

When kaneki became an investigator , his rc cells were suppressed which made him more of a human(still a ghoul though) and due to that his hair started to return back to his normal colour(black) , rc cells affected his melanin levels.

Why did Kanekis hair change?

kaneki had a black hair that changed white because of the stress and fear he was endouring while getting tortured 2-3times a day for 10 days.

Why is Haise’s hair turning black?

“Blood… my skull is split and I taste honey.” (Haise, :re Chapter 53) Kanae repeatedly kicked him in the head, he cracked his skull and that’s why his hair is covered in blood now. Most Mangas have a black-and-white style, so his hair has shown to be black because of the blood.