I resized a platinum ring (up) today with 1600 and no flux, I
had to use gentle heat at first to keep the solder in place, but
the welds were pefect. Sure do like my Didymium glasses.
Hiya Rick, You may tell me to go suck eggs as to how to advise
you to solder platinum. In all shanks or bands depending on your
own accent. I come from New Zealand not to far away from the
home town of John Burgess so as radical as ever with no solder at
hand i take a very small amount of the same metal that the ring
is made from. Sample from band is preferable. Flatten with bench
hammer observing carefully which way it has jumped out from under
your hammer and landing after circumnavigating your work studio.
Retrieve item and note where you have put it.!!!
File join square and with tension position small flat of metal
With your new found glasses or personally I will post my design
half glasses on the page one day in the future. Didymium glasses
are good however it is just what up get used to. Not that I would
not change if I was proved wrong. I am far from perfect.
Apply heat to join and just watch as the platinum pallion melt
into the band.
Conclusion: No solder mark and secondly no where after polishing
to you see "polish out" No need for solder which will weaken the
band. No flux nice and clean!! Lastly no hassles engraving sides
of band ..
Epilog: Any correspondence welcome re sizing. John (Aurum) (may
the flux be with you but not when using platinum