When you're pinning pieces to a charcoal block, what kind of wire
do you use? Does it need to be painted with yellow ochre, or is
there some kind of wire that doesn't stick to solder?
The best pins (or straight pieces of wire) to use when pining
something in place for soldering is a pin/wire made of steel,
stainless, iron, or titanium. Solder doesn’t like to stick to these
Other tricks are to keep the pins away from the solder joint & if
possible position the work so friction &/or gravity keep the pieces