Officers Badge plating question

[didithevan]

So, I understand how the silver plating (at least shiny effect, frosted is a different issue) is achieved on officers badges from having repaired one or two lugs before.
My question for today is, what was the process used for applying the gilding effect on badges? I see two sorts like the silver ones - the shiny and frosted appearance.
I have a couple of lug repairs I want to do and would like to be able to finish of the repairs so that they look reasonably as good as new (you know what I mean). These are for badges of purely personal interest (and 1 isn't even British, but one I collected on exchange that I cannot replace).