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Why do I have to use different tweezers when using pickle and soldering?

If you use ferrous metal tweezers in pickle the copper oxides in the pickle will become suspended in the solution. This can cause your pieces to be contaminated and the silver to be plated with copper.
 
To stop this from happening make sure you use either brass or plastic tweezers to remove your pieces from the pickle. The same reaction happens if you leave the binding wire on, so be careful to remove it before pickling.