Filip,
  I doubt very much if a jeweler is using .999 pure silver wire for 
jewelry...it's too soft. A friend of mine who is a jewelry maker uses sterling 
silver wire. Which is what I bet you are trying to make CS with. This is 
probably at least part of your problem, as sterling silver contains some copper 
and, probably nickel. I don't know what you are making, but please try some 
wire from 
https://secure2.websitecomplete.com/acbel/shop/showProd.asp?prod=13

paula
----- Original Message ----- 
  From: [email protected] 

  Sorry if my post()s is/are elaborate, but I really want to find a solution to 
my
  problem and I try to give as much as context as possible.

  Two weeks later, I wanted to give "making CS by myself" another try. This
  time I used 2 silver electrodes that I ordered from a jeweler that made it
  from 99,9% silver grains that he uses for making jewelery. I expressed my
  reason for needing to be sure it is 99,9% pure.