If steel (binding wire or tweezers) comes in contact with pickle, it can cause a chemical reaction that will copper-plate whatever metal is in your solution. To prevent this, use copper or plastic tongs to place metals in the solution (Figure). When the metal is clean, remove it from the pickle using the tongs, and rinse the metal in water.
You can reuse pickle; you will notice that it becomes less effective over time as it becomes more and more blue in color (due to the copper it has absorbed). When the pickle is exhausted, let it cool, pour it into a large container, and then neutralize it with baking soda. If you are using a natural pickle (like citric acid), you don’t need to neutralize it. For any pickle, contact your local authorities for proper disposal methods; you do not want to add copper to your local water supply.