Hi. I was recently looking at a gold plate, recent date and about 22-karat gold. The gold sheet was about 1 mm thick. The surface structure puzzled me. Any thoughts? My guess is acid etched, but I haven’t seen anything quite like this before. An alternative was that it was electroformed, but as the rather 2-dimensional decorative elements were soldered flat onto it on, not integral to it, that seems unlikely. I don’t have an exact scale for the photo, but I reckon it is about 10-12 mm across, so quite a coarse structure - which I imagine also counts against electrofroming.
And talking of acid - has anyone used chromic acid on gold to clean or give a matt surface?
Would love to hear any thoughts. Thanks