I don't know if anything has changed, but Cookson do a Pd solder
which works well enough. How well did the Pt solder work? I would
have thought the melting temp is higher.
I made a pair of Pd wedding rings last year and used Cookson's Med
Pd solder (they don't do a Hard). The rings were returned after about
6 months because the solder had turned grey after a visit to a
swimming pool. (See my post of 5 March called "Soldering Palladium").
It turns out that Med Pd solder is 89.8% silver and only 4.6% Pd,
and it was the silver that discoloured (I assume).
Interestingly, the Easy solder is 12% gold, 47% silver and 17% Pd,
plus other unspecified metals, which is not very different to Pt
I didn't know about Pd being an oxygen hog, but am aware that it's a
hydrogen hog. I use a water torch (oxy-hydrogen) for most of my
work, and haven't noticed any undue problems.
Regards, Gary Wooding