He attached two coated copper wires to the two terminals on a 9-volt battery. He then put the other ends of the wire into a jar of water mixed with baking soda. The ends began causing electricity to flow through the water and we see this in the bubbles and fizzing that was coming off the ends.
This caused the wire connected to the positive terminal to turn a bluish green color; similiar to what you might see when a copper item becomes discolored in weathering over time.
Very cool!
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