Silver was a metallic shade of gray, the color of silver. Black and white movies were sometimes referred to have appeared on the silver screen. (VOY: "Course: Oblivion")
In 2152, Jonathan Archer told Doctor Phlox to open the silver panels first. (ENT: "The Crossing")
In 2268, while visiting James T. Kirk's USS Enterprise, Jadzia Dax admired the 23rd century tricorder designs, describing them as having black finish and silver highlights. (DS9: "Trials and Tribble-ations")
Also that year, while inhabiting the body of Ann Mulhall, Thalassa recalled sitting beside a silver lake with Sargon. (TOS: "Return to Tomorrow")
In 2364, William T. Riker described a thought maker as a silver sphere and told Jean-Luc Picard to destroy it with his phaser in order to stop its influence over him. (TNG: "The Battle")
In 2368, Data described the Devidians as being silver grey in color. (TNG: "Time's Arrow")
In the final revised draft script for "Where No Man Has Gone Before"[1], after he been infused with psionic energy, it was written that Gary Mitchell's eyes had turned to a bright metallic silver.