See post #5:-
http://www.vikingsword.com/vb/showth...412#post288412
A little more in depth info:-
https://journals.openedition.org/artefact/1996
EDIT
there is another material that is sometimes used in ornamentation in SE Asia, & that is tin, we often find it used in seluts, where it is nearly always mistaken for silver --- until the little bottle of test fluid gets opened.