I use the cyanide variety. I have a hypodermic needle jammed into afelt tip (from a pen-plating set) and I clip that to my rectifier andplate away. I do it also with rhodium plating.
Siobhan- Whether or not you use a brush plating system or immersion,you will need to mask off the areas you don't want your plating togo to. We use nail polish.
Have fun and make lots of jewelry.Jo Haemertimothywgreen.com