Dear Markus, Charles, Dave, and all,
Thanks for the info. It looks like the easiest etching mix
would be forfine gold, Nitric and hydroclhloric.
I have a couple more questions:
How hot should the solution be?
I was thinking about casting the fine gold into recesses in the
platinum, a sort of cast inlay. I have never cast fine gold, and
I am wondering if it freezes/solidifies instantly before it could
flow into the flask and the platinum… Does it stay liquid long
enough to cast, or should I use 22K?
It sounds like (per Charles) the gold needs to stay hot for an
extended period to form a large crystal structure. I was
thinking about casting the flask, and then putting it immediately
back in the oven instead of quenching it. It would gradually
cool from about 1000F to room temp in 1-2 hours.
Do you think a high polish surface on the gold would be the best
surface to start with?
I will definately do a test run on this will a small piece of
platinum first! Too big $$ to mess up!