hi, these are some of the comments i was looking for on moneta-l,
You can buy a solder removal suction syringe, heat the coin up till the solder
becomes liquid then just suck it off with the syringe, anything remaining can be
wiped off with a piece off leather/hide cloth like what safety gloves are made
of. Dont forget it going to be hot so be careful.
There is also a material called "solder wick" which is basically a
"braided" copper rope filled with a bit
of rosin. It will suck up most
of the solder (even better than the solder sucker) it will leave behind
some of the rosin, and perhaps some of the solder, but depending on the
metal in question, it is possible nothing will get it all off...
Although the solder wick will only suck up solder it can, and perhaps
leave behind some rosin... if you catch that hot rosin/flux with
something tough, Like the leather i saw mentioned (do it outdoors
you might get enough of the solder to make it unnoticeable... And when
he said hot... remember, solder melts at around 600 degrees... Your
oven baking a cake is Cold by comparison... needle nose type
be used to hold the coin... but then again... we are talking about
potential damage again...
If the coin in question can be cleaned with no problem if the "patina
is removed or altered (Likely so, since is has solder on it) you can get
yourself a propane/butane torch, with the proper head
(I like the kind
that produces the little blue pointed inner flame (with the larger blue
flame surrounding it) Heat the coin to red
hot... you can let it cool
in air for a couple of minutes (don't be stupid and see if it is cooled
by touching it) or give it a dunk in CLEAN cool/warm (NOT icy cold) water...
After that, use normal cleaning methods... dip, acetone (Nail polish
remover, but PURE acetone is better, no oils and that) Formula 409, soap
and a extra fine
toothbrush, etc... You will likely remove a LOT more
solder, but you will have a different looking coin, but given a little
time, it may begin to look proper... also, after cleaning it down to a
shine... a good
EVEN heating, not quite to red
hot, will "speed up" the
aging process... it won't look perfect, but if done properly, it will
some of this info helps!