silver
From Trekipedia
Silver was a precious metal. Spock wanted gold to create a mnemonic memory circuit when he and Captain Kirk time traveled to 1930, but the pair did not have the money to buy any appreciable quantities of the metal.[1]
Notes and References
- ↑ Roddenberry, Gene (Executive Producer). "The City on the Edge of Forever." Star Trek, Season 1, Episode 28 (Production 28). Directed by Joseph Pevney. Written by Harlan Ellison. Desilu Productions, 6 April 1967.