Yes it's unlocked by golding one of your jewelry pieces, I just applied that to my tank in heavy armor with blue highlights on the shield. I saw it on one or two characters previously and it stood out
Please do a search before starting a new thread. There is already one on the first page, answered by a ZOS employee who says they are 'looking into it'.
I think weapons should be dyeable, but ONLY limited to tints of metals from ores in game. You should be able to tint a weapon using ingots in the game to hue the weapon of the color of that ingot (and
I don't know that I would pay crowns for something like this, but it's definitely something that should be added, considering we can already die our armor.