Snow miku's silver boots + sleeves turned yellowish?

Hi, I took out my snow miku today and I noticed the silver part of her sleeve + boots are turning yellow/bronzish, why did that happened? it's yellowish evenly.

You aren't the first person to report that. No idea of the cause, but it seems like it's something that can happen. It could be something environmental like humidity, sunlight, or smoke. I would think if it is a material defect a lot more people will be reporting it as time passes.

 

I don't see any yellowing on mine.