User blog comment:Maimer1882/Metal.../@comment-3146930-20110929025457/@comment-3459279-20111001162332

I think that the Hunters arrows look silver, because that is Artemis's color scheme, otherwise they are magical in that they can be whatever they need to be to defeat the monster they are fired at. Remember, in "The Titans Curse" Zoe and Bianca had their arrows when they needed them, which means they are magical in some way.