I would recommend black iron binding as it is softer and easier to
bend I only ever use #8 or sometimes much thicker florists black iron
wire for silversmithing.
I find the thin wire will not stand the heat and burns out quickly.
Because #8 is thick means it does not need to be tightened so much to
hold the join or components together.
Indeed I always ensure that the join holds its self together
perfectly prior to soldering, the binding wire should only be to
maintain the contact of the join during the soldering with minimal
tension. Stainless has the added disadvantage, as it is ‘clean’ ie.
it has no oxide on its surface therefore solder is more likely adhere
and run than with the black oxide coated iron wire.
Try not to let solder contact and run along binding wire so it is
joined to the silver. If you do, then do not put it in the pickle.
When the work has cooled cut the wire and grasp an end with a pair of
fine round nosed pliers and coil the wire round the tapers. If that
does not work file off any solder and wire that is joined to the work
piece. Only then put the work in the pickle.
David Cruickshank (Australia)