In the X-Files there is some mention of Scully's real hair color, this is bugging me. Whta was it ?

I don't think there is. Except for the pilot, her hair is alway more or less red, but I am not sure of they ever mention it.....

There is? Oo You sure it's not just some joke you've heard or something?
I have to agree, though.. her hair just keep getting more and more red through the seasons xD