What color was Ayu's hair during the (m)u era?

[kokoroikusa]

Like, during early 2006...when she had dark hair. Different magazines showcase her hair color differently. For example:

http://www.gwareth.org/gallery/Ayumi...8a8da.jpg.html

http://www.gwareth.org/gallery/Ayumi...60106.jpg.html

http://www.gwareth.org/gallery/Ayumi...01/13.jpg.html

and http://www.gwareth.org/gallery/Ayumi...2_002.jpg.html

So would her hair color be considered dark auburn...? Or dark brown?

Thanks!