Hello Séverin,
Have a thorough look under magnification to verify that the color sits on top of the material (rather than being the base metal if any silver layer is about to wear off); I don't think the latter possibility is likely here.
If it sits on top, a gentle touch up with a silver cloth will quickly remove yellow oxidation of silver alloys while remnants of gilding tend to be more stubborn. (More abrasive silver cleaning products can remove both!)
Regards,
Kai
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