it is black but sometimes it is blue so like dark blue a little
A fan-given nickname is Duck-butt, because of his hair stlye. But he doesn't have one in the animanga.
No
His hair color is blue
If you mean the time when he fought Naruto in 1 tail form at the Vally of the End, it's because of the cursed seal.
Well they would have sasukes dark hair and dark eyes, but with sakuras complextion. So cute n-n
"What colour is your hair?" is correct.
Really good!
He doesn't have one.
Sharingan
Hair color is a product that can be purchased in many retail stores. When applied, hair color will change the appearance of your current hair color.
Suaskes (?) If you're talking about Naruto, Sasukes parents actually get killed by Itachi (Sasukes older brother)
Yes, you can apply permanent hair color on top of semi-permanent hair color. Make sure that you do a deep conditioning treatment or hair masque before and after you color your hair.