Reverse gold electroplating-a battery,salt,water and vinger
2013year1month3day · Location. Astralasia. Jun 20, 2008. #1. HI all, I was playing with some reverse electro plating. I was using water, salt, vinegar, 4-D cell batteries, a gold plated sterling silver medal, and a copper penny. After running the process for 1/2 hour the gold plating on the coin turned black. I thought ewwww, thats horrible, and scrapped the black ...
