Electroplating is the process of coating an item in a metal surface, like my example here is coating plastic buttons in copper. Here is my setup, a bath hooked up to an electric charge that will deposit copper ions from a sheet of copper onto my plastic button pin!
Here you can see button rings that I have done in the past! One has been left with copper exposed and the other is with an oxidized copper.
I had this in the bath for about 40 minutes. It has a very thin coating, but I will keep it in for longer because I want a much thicker coating.
Here is the back side with just the copper conductive paint. I prefer to have lower voltage over longer time because I think it gives a better coat of copper.