Hi Jef,
Sorry, I was detached performing family duties... :roll:
I am afraid that my knowledge about Spangenhelme is not enough as to being of some help for you... :oops:
Anyway, I think that gilding on Spangenhelme elements is only applied on the copper alloy and DIRECTLY on them, via mercury gilding or sticking gold foil on them.
The proccess is quite different on Late Roman helmets: On them, all the components (usually, they are all made of iron, though some copper-alloy ridge creeps in from time to time, like those belonging to the Concesti and Augst helmets) are wrapped in copper or silver sheet (usually, much less than 1 mm thick but never as thin as foil). Here you can see one iron (plain) component and its detached (embossed) silver sheathing, both seen from the back:
And here, both assembled, back:
and front:
Sorry for the very poor quality of the pics. I've taken then a moment ago, with artificial light and no tripod... :oops:
Aitor
It\'s all an accident, an accident of hands. Mine, others, all without mind, from one extreme to another, but neither works nor will ever.
Rolf Steiner