Aluminum is a partial substitute for copper; currently copper is more then two times more expensive then the same weight of aluminum. Aluminum is also a component of the Deutsche-bank commodities index DBLCI which is tracked by the DBC ETF.
source: http://cmd-chart.blogspot.com/
![SharpChartv05.jpg](/proxy.php?image=http%3A%2F%2Fphotos1.blogger.com%2Fblogger%2F7214%2F1988%2F1600%2FSharpChartv05.jpg&hash=68c0516503b590db98db9b0a1167b06a)
![cpr.jpg](/proxy.php?image=http%3A%2F%2Fphotos1.blogger.com%2Fblogger%2F7214%2F1988%2F1600%2Fcpr.jpg&hash=970bc05455a7ef98dff14ad23f3b0284)
![alum.jpg](/proxy.php?image=http%3A%2F%2Fphotos1.blogger.com%2Fblogger%2F7214%2F1988%2F1600%2Falum.jpg&hash=a7745a02aa3961d2f7e3bf10ff9d3e7f)
source: http://cmd-chart.blogspot.com/