Weeks after coloring your hair, you start to notice something strange: the shade you left the salon with is no more, and now your hair has taken on an undesired yellow, orange or red tone. What gives?Brassy hair, that’s what. Not only does brassiness effect blondes, but brunettes can also experience unwanted orange and red tones. While these unwanted pigments can be incredibly frustrating, we're here to help. Read on to learn what causes brassiness, how to prevent it, and how to get rid of brassy hair.