Hello, I am searching for some helpful hints on successfully
soldering new 14 karat red gold to an old 14 karat rose gold wedding
band. I attempted to use a 14 karat easy red gold solder (1350
degree F) and the old metal bubbled and fused to the new 14 karat
red gold before the solder could reach flow temperature. Then, of
course there was con- siderable pitting to deal with during cleanup.
I have found the rose gold solder does not need to melt all the way
to fill the joint ,I prefer white past flux for rose gold.I am sure
the alloys of the new gold and old gold are different . My approach
would be to get a little decorative around the joint something that
goes with the rest of the design,even to add a thicker piece of a
different color say a 18k yellow in the joint.It would be a more
pleasing line that to have a bad solder joint. Anything to cover the
joint ,My customers would usally like the idea.