Undyeable Weapons

Tried Searching for this but couldn't fine one so...here goes.
I tried dying my Wingblade, but the sword wouldn't dye. I'm not whining because the blade's color would not change. The dye would not be consumed at all. I tried it on 3 of my wingblades, and the dye would not work for any of them. Does anybody know the reason why? Was this done on purpose? I do not know of any items that aren't dyeable except for wingblades

My case is even worse. I dyed my bow. The dye disappeared but the bow still the same.

some items cant be dyed , i think there should be a weapon customizer for looks, so we dont all look like clones