Note Footnote 9 — CHAPTER TEN

Pour over the piece of copper enough of the cleansing solution to cover it.9 The cleansing solution contains strong acids. If you get any on your skin or clothes, wash it off immediately with ammonia or soda. As soon as the copper is bright and clean, take it out of the cleansing solution and suspend it by the negative wire in the green nickel solution. You can tell if you have it on the negative wire, for in that case bubbles will rise from it during the experiment. The copper should be entirely covered by the nickel solution, but should not touch the bottom or sides of the bowl. Pour the cleansing solution from the evaporating dish back into the bottle. Suspend the nickel, in the same way as the copper, from the positive wire crossing the bowl. When set up, the apparatus should appear as shown in Figure 178.