I have several TI's with the blond horn scales, when I got them a couple years ago now the scales were almost pure blond close to white with just some traces of brown in them, it seems they are either aging or changing color and have considerably more dark brown or black streaks in them.

Is this normal or something I should be concerned about? the blades are all fine. can the scales be restored and how and if so is it something that needs done soon or can it be done anytime?