I have learned that electroplating is really more of an art than a science. First I started out with a copper rod. The rod was then completely plated with silver. I then covered 1/3 of one side with gold and then the tip of that was plated with nickel. The other side was plated with copper and then zinc on the tip. The visible copper isn't actually the base metal but another plate. Needless to say, quite a bit of time went into thinking through what order I was going to plate.
The gold complicated the whole thing because it can't really be polished due to it's softness. This means that both the gold and the nickel have to have a perfect plate or else the gold will rub off.