I am a jewelry maker in Hong Kong. Invented a new method of
protection for silver jewelry which might be the strongest ever
existed. The protection can also be applied in jewelry articles with
all kind of metal plating.
the below video link demonstrates the protection!
http://www.kilopico.com/promovideo/PIC_0009.swf
The chain which does not change color is Nava silver chain.
As I know the coating also works in silver plated jewelry!
Ray Chan
Kilopico Ltd.