There is a curious trend on Gielinor, whereby the most fragile fighters - archers and magic users - are the easiest to spot. From blue dragonhide to mystic robes, the fashion is to wear garish colours as if the rules of the animal kingdom apply. But no, archers and magic users aren't poisonous, venomous or hoping to be mistaken for a bee.
We wonder why that lack of subtlety might be. In the case of blue dragons and their scales, perhaps it's a cruel joke played by the dragonkin. They have seen that humans keep killing their creations, wearing their hides as trophies. They've got their revenge by way of a generous use of the rainbow.