Infanterie Tabs and Boards ?

[wachmeister]

Hi guys,

I'm looking for some help explaining the Waffenfarbe on this Officer tabs I got together with Inf. boards. Would it be possible that the metal wire used for Waffenfabe has oxidized over the years ...

Cheers
samo

[wachmeister]

The two tabs in question ( middle) together with some more obvious ones .