The first time that I responded to this thread I didn't notice that
there was mention of pits. The question seemed to me to be about the
annoying properties that allow gold solder to be pulled from seams when
rouged in the direction of the seam.
Pitting is an altogether different problem. There are two solutions
to pitting that I was taught. First, make sure that the seam it clean. A
little rouge or tripoli in the seam will cause nothing but problems. Rouge
is even used as an anti-solder. Watch for contamination. Second, don’t heat
the solder. Heat the metal you are trying to solder. Get the metal hot
enough to accept the solder. Heating the solder has a tendency to force gas
into it, much like carbonating water.
If one has done the best one can do at the two above suggestions,
and one still has pits, run a sawblade through it and try again. If you are
too lazy to do this, (bare in mind that a seam with pits is not of optimal
strength), burnish the pits during finishing. A hand burnisher or an old bur
ground to rounded, and high polished surfaces like a ball peen hammer and
run on the flexible shaft.
To reiterate, this is the problem: Example, I size a ring, everything goes
picture perfect, solder not heated directly. Everything looks fine, ie; no
pits, etc. Even after using tripoli, and this is with close inspection
under a microscope. I then properly clean the item with a steamer and then
in the ultrasconic (not a trace of tripoli left) I polish it with red rouge
and it “seems” to me that it draws some of the solder out leaving small
visible pits that weren’t noticeable (for whatever reason) before. I can
fix this easily by “beating” it with a special “porosity” killer tool I
have. This doesn’t happen all the time but I have seen it way too much for
my comfort. I thought maybe my problem was in the making of my solder but
maybe I’m just not cleaning the pieces well enough before soldering on them.