Giro, welcome to the forum...

Those tests were done many years ago. There has go to be some new information in the new Honor ring book. The author is a member here and sometimes looks in,,maybe he'll comment.

I would think that throughout the HR history there has got to be another metal alloyed in with the Silver and Copper. It's probably in the book...

Any members with the new book and would like to provide the alloy,specs etc. it would be appreciated..