Mercury (element)
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Mercury was a corrosive chemical element found on many planets, including Earth, Go-Ray and Skaro. Mercury could easily be found in any scientific community, particularly in labs. (TV: The Daleks)
Exposure to mercury had a negative effect on many species, as well as robots. A canister of mercury was used to corrode and disable a Gold Assassin who was on board a Roman sailing vessel. (COMIC: Golden Slumbers)
Mercury poisoning was a common complaint among sailors. Amy Ivans, a passenger of the Lankester, was being poisoned with small doses of mercury, administered by De Requin. (AUDIO: Cryptobiosis)
Mercury was as poisonous to Time Lords as it was to humans. The Second Doctor evacuated the TARDIS when mercury vapour flooded the craft, telling Jamie that the vapour "would have killed us." (TV: The Wheel in Space). On Dulkis the overloaded fluid links ruptured again, upsetting him to the point of panic when the vapour filled the air. (TV: The Mind Robber)
Many devices required mercury to function. For example, on Go-Ray, the First Doctor, John and Gillian acquired mercury to repair a cardium reactor. (COMIC: Enter: The Go-Ray)
Another example is TARDISes' fluid links. The First Doctor falsely claimed that his TARDIS' fluid link had run out of mercury as a ruse to explore the Dalek City. (TV: The Daleks)
The Second Doctor visited the Panjistri homeworld to stock up on mercury. (PROSE: Timewyrm: Apocalypse)
Later, the mercury in the fluid links evaporated, forcing the Second Doctor and Jamie McCrimmon to evacuate the TARDIS. The Doctor later acquired a tiny bottle of mercury on Space Station W3. and proclaimed it plenty, with some left over. (TV: The Wheel in Space)
The Fourth Doctor acquired some needed mercury in 1931 Chicago, unknowingly defeating the Master's plans by doing so. (PROSE: The Duke of Dominoes)
The Eighth Doctor visited a podule orbiting Jupiter in search of mercury for his TARDIS' fluid links. (PROSE: To the Slaughter)
The planet Vulcan had mercury swamps on its surface. (TV: The Power of the Daleks). They created such a toxic atmosphere that the colonists avoided the area.
Skaro had geysers of mercury. The Dalek Emperor attempted to kill Zeg near one of them. (COMIC: Duel of the Daleks)
The Acteon Galaxy had asteroids made of mercury. (AUDIO: Neverland)
