So, when trying to dye Ringmail, Bone or Dragon armor's with the Metallic Dye Tub's, be it leather, metal, or cloth tub, they do not accept the previous armor types as a viable metal or leather material. I'm not sure if there are more armor types that have this problem, but would be willing to test it provided the need for it. Metal made weapon's are also not dyable even though they are made of metal.