Yes, it is possible to solder and melt noble metals with MAPP and
O2. If you add O2 to the MAPP it will problably give you several
thousand degrees. It is expensive however and you can probably
accomplish the same thing with propane and air! In fact, many people
use simple propane which burns quite a bit lower in temp then MAPP.
Cheers from Don at The Charles Belle Studio in SOFL where simple
elegance IS fine jewelry! @coralnut2