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Doctor's Corrosive Acids (Sulfuric/Hydrochloric Mixture)

The Doctor uses a mixture of sulfuric and hydrochloric acid from Eldred's laboratory supplies to neutralize a rapidly expanding alien (Martian) fungus sample under a microscope. The clear, corrosive liquids react violently with the fungus—hissing, bubbling, and nearly exploding—while forcing both men back. Despite the near-detonation, the acid mixture effectively shrinks the fungal mass, proving its potency against the oxygen-depleting bio-weapon threatening Earth. This volatile treatment demonstrates the acids' critical role in countering the invasive organism. The acids are used in tandem, with sulfuric acid being the primary agent and hydrochloric acid contributing to the reaction's intensity.
1 appearances

Purpose

Corrode and neutralize the oxygen-absorbing alien fungus

Significance

Delivers the first effective counter to the Ice Warriors' terraforming scheme, buying time against atmospheric collapse and exposing the invasion's ecological weapon

Appearances in the Narrative

When this object appears and how it's used

1 moments
S6E27 · The Seeds of Death Part 5
Doctor neutralizes fungus with acid

The Doctor’s hydrochloric acid, the second reagent in the experimental mixture, complements the sulfuric acid in breaking down the fungal structure. Its fuming, clear liquid reacts aggressively with the sample, contributing to the near-explosive foaming that forces Eldred to urge evacuation. The acid’s role is less about precision and more about brute-force disruption, aligning with the Doctor’s high-stakes, no-time-for-subtlety approach. Its inclusion in the solution underscores the urgency of the situation—only a potent, immediate reaction will do.

Before: Stored alongside other acids in Eldred’s laboratory, its corrosive nature and fuming properties are well-documented. The Doctor grabs it without hesitation, trusting its destructive potential.
After: Significantly reduced in volume after being poured onto the sample. Its reaction with the fungus is a key factor in the experiment’s success, though its residual fumes linger in the lab.
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