3 Sewars for comment

Battara · 27th November 2020, 04:08 AM

It could also be oxidation. Some alloys of silver have copper that can give a yellow tinge when oxidized before it goes brown and then black.

kai · 27th November 2020, 09:11 AM

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

27th November 2020, 04:08 AM	#1
Battara EAAF Staff Join Date: Dec 2004 Location: Louisville, KY Posts: 7,346	It could also be oxidation. Some alloys of silver have copper that can give a yellow tinge when oxidized before it goes brown and then black.

27th November 2020, 09:11 AM	#2
kai Member Join Date: Apr 2005 Posts: 3,255	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