Before afters
I took a 9 volt ac adapter from an old cordless Home phone snipped the ends and attached alligator clips one to each end. Clip one end to a coin the other to a metal washer. In q bowl put baking soda andwater and put the two end on the water. One will bubble a lot more then the other. This is the side the coin should be on.
Its at work but ill upload one tomorrow.