Does hair colour actually affect attractiveness?

I can see the benefits of a flattering hair cut, but does hair colour really have much of an effect? I've heard some studies say objectively it doesn't affect someone's overall attractiveness but their are cultural/social associations with hair colour that make someone seem more attractive (e.g, the blonde bombshell). I recently dyed my hair brown from blonde and many friends/acquaintances didn't even notice (pics in profile). What are your guys thoughts on this? I've heard anecdotes that women are treated better as blondes.