The 1832 arsenic murder that created modern forensics #truecrime #forensics #history

Añadido: 2026-05-06

[00:00:00]How do you catch a killer when the murder weapon completely vanishes?

[00:00:04]London, November 1832.

[00:00:07]>> [music] >> A wealthy grandfather drinks his morning coffee.

[00:00:10]The bitter taste goes unnoticed until violent illness strikes him. [music] Police arrest his grandson, John Bodle, suspecting lethal arsenic poisoning.

[00:00:21]Chemist [music] James Marsh extracts a yellow precipitate from the evidence.

[00:00:26]>> [music] >> But this chemical compound is highly unstable in open air. By the trial, the crucial yellow evidence completely fades away.

[00:00:34]Without physical proof, [music] a guilty murderer walks free from court.

[00:00:39]Outraged by this failure, [music] Marsh designs a custom glass apparatus.

[00:00:44]He mixes stomach acids with zinc and sulfuric acid drops.

[00:00:49]This reaction converts liquid arsenic into highly flammable arsine gas.

[00:00:55]>> [music] >> Heating this gas creates a permanent, undeniable, silvery metallic mirror.

[00:01:00][music] Science finally conquered deception, proving that the truth always leaves a trace.