A-420 421 Packet 90%

Its legend now exceeds its lethality. No A-420 packet has been confirmed in active military use since 1989. The vast majority were destroyed under the Chemical Weapons Convention (1997–2012). But as long as forgotten bunkers exist, the ghost of A-420 will linger — a numbered artifact of a time when chemistry was weaponized, and every aluminum canister told a half-truth. Sources: FOIA release DTC-2004-0382; US Army TM 3-666 “Binary Chemical Components, Storage and Handling”; “The Vomiting Agents” – SIPRI Chemical Weapons Monograph, 1973; Pine Bluff Arsenal Decommissioning Report, 1999.

Using portable Raman spectroscopy, they identified unreacted diphenylamine — but also detected trace arsenic trichloride migration through a corroded seal. The packets were , effectively intermediate — neither safe precursor nor stable agent. They were declared “Type II Binary Residue” and incinerated at 1,200°C. A-420 421 Packet

By J. C. Vane Cryptolog Files, Vol. 14