(edited by Jonto.2160)
Twilight Arbor Armor
I believe in cookies.
As a sylvari, i have a similar issue with the heavy armor set. I can dye the entire set white (or any other color for that matter), and yet there will still be blue highlights all over the armor.
I have seen a human with this armor and he had no trouble dying all his armor, but he also transmuted it to his crafted gear.
This leads me to believe the problem is either racial(read sylvari), or exists until you transmute it to another piece of gear.