It's interesting to note that a Brilliant Energy weapon still weighs the same as a weapon made of metal, though. Since it still maintains some properties of a metal weapon, I can easily see the arguement that it could keep the rest as well.
Furthermore, BE is already overly expensive at a +4 bonus cost. If it also nullifies another bonus of the weapon, it's even worse. In my game, I would rule that it still counts as cold iron for that reason alone (though that's not a valid rules arguement).
Furthermore, BE is already overly expensive at a +4 bonus cost. If it also nullifies another bonus of the weapon, it's even worse. In my game, I would rule that it still counts as cold iron for that reason alone (though that's not a valid rules arguement).