Anyone with experience making Colloidal silver?

I was hoping to brew up a batch of colloidal silver to get some feminized seeds. It sounds simple enough, I was just wondering if anyone who has made it before could tell me if it damages the silver object they used as an electrode in anyway? I guess it will tarnish it or something?

I've got all the other ingredients laying around my house, so if I can just use my girlfriend's jewellery that would make things easy! A lot of guides say you need 99.9% pure, but I believe that is only important if you intend on consuming it. From what I've read drinking it isn't a good idea anyway! Well, thanks for any input

I was thinking about whipping some up but it was way easier stopping by the vitamin shoppe and paying like $12 for a spray bottle of it. Remember it should at least be 30ppm, so I've heard.