I’m currently working on a piece with an African design in 18k
yellow gold. For some of the recessed parts I was considering using
a patina. I know that 18k might be a problem. I would like to
blacken or at least partly oxidize it to a dark brown/black color
with a reasonable contrast. Should I try potassium sulphide perhaps?
I know that normal heating also causes oxidation, but would the
copper oxide be as reliable as the copper sulphide? It is a pendant
so wear shouldn’t be a problem. Also the design is quite intricate
so could I mask out places or would I need to patinate the whole
piece and then remove the oxide where needed? Any ideas?
Thanks in advance