Copper


 * For the individual, see Bayldon Copper.

Copper was a type of metal. When oxidised, it would turn green in a process called verdigris. (PDA: Verdigris)

When the Timewyrm possessed Dumuzi, she had him place copper around the walls of Kish, turning it into a giant radio transmitter. (NA: Timewyrm: Genesys)

Copper was used in the casing of Earth bullets. When the Sontarans invaded in 2009, they used Cordolaine signals to excite the copper, causing it to be stuck in the barrel. (DW: The Sontaran Stratagem/The Poison Sky)

Kaleds had copper in their blood, giving it a green colour. (BFA: Corruption)