Silver can be chlorided quite easily by immersing it in bleach for a short while (10 sec to a few min). The color should change, from the bright silver you know and love to a dull, darker gray. You can buy Ag wire for this purpose, or, I imagine, creatively salvage some from another source.
EKG electrodes seem to be readily available, and cheap, too, in the US. IIRC, even the hypo-allergenic ones I had to get one time were not particularly expensive. I don't know if the rules are different in Finland.
Yep, this is the "easy" way to chloride silver wires in the lab. I've chlorided silver wires by immersing part of the wire in bleach (regular household Clorox) and taping it in place so it sits for ~10-20 minutes.
Silver wire is pretty cheap online, so it's not too hard to get started.
