It was my conclusion too that a lot of these trace elements are the
result of primitive refining techniques.
I’m looking at alloy analysis in “The Viking-Age Gold and Silver of
Scotland” by James Graham-Campbell
The items are in between 850-1100.
Looking at the artifacts, you can determine how they were
manufactured, some very complex patterns created with very simple
The reason to add the impurities, as it were, is that some customers
appreciate the extra attention, and will pay.
Kindest regards Charles A.