How can you tell if a wire is aluminum or copper?

[1-LVDCPN]

[/url]
Check any uncovered outlets or switches to see the color of the exposed wires.  Aluminum wiring is silver while copper, the other most common metal used, is a distinct yellow color.
[url=https://www.quora.com/How-can-you-tell-if-a-wire-is-aluminum-or-copper]