Overnight, LME copper opened at $9,882/mt, fluctuated widely at the beginning, reaching a high of $9,908/mt, then kept falling, dropping to $9,740/mt near the end of the trading session, and finally ...
Straight copper pipe, at least 30cm long. 15 or 22mm diameter central heating pipe works well. (A hardware store may lend you a piece for a minute just to try this out) A circular neodymium magnet ...