If you are a writer and want to get creative in describing your character's hair/eye color, please for the love of all that is holy, know what color you are using. Amaranth is not a shade a purple. I can only assume you were thinking amethyst when you wrote that. If you are not sure, Wikipedia has a very awesome
list o' colors to help you out. They even include the RGB of them.
Friends don't let friends give Duo Maxwell pink eyes.