I have etched Argentium Sterling using Ferric Nitrate. It worked
great! I added some citric acid to make it the silver version of an
Edinburgh Etch. (Citric acid makes the solution last longer, and
work more effectively, because it makes the metal precipitate out of
I have not had a chance yet to electro-etch AS. I expect that if you
have successfully etched traditional sterling, the same system will
work for AS.
Whatever resist you like will work fine. I cannot compare etching AS
to traditional SS, because I have not used SS since 1999, and I
started etching after my friend Karen Christians taught me in 2004.
You mention that you have not used the AS yet. Please read one of my
articles, or watch Ronda's video, or take a workshop. It can be
surprising how differently AS heats up with a torch when annealing,
soldering, or fusing. Information will help you be more effective