I have been using oxygen & LPG ( Liquid Propane Gas ) for years to
melt gold & Silver. I had the thread changed on the acetylene gauge to
fir the LPG bottle & it works fine. I have been told by the people
that refine my gold that this is better than using acetylene for two
The flame is cooler & has less of over heating the metal.
Acetylene combines with the alloy & make it brittle.
The flame is still hot enough to melt palladium white golds but not
hot enough to melt Platinum.
LPG is much cheaper than Acetylene which is another good reason.
Hope this helps.