[AFB-XYZ]

Pretty unsettling, for sure.

Also, others probably know a heck of a lot more than I ever could — but isn’t chlorine gas another name for mustard gas? Very bad stuff if so.

[grey_whiskers]

Nominally mustard gas is SCH₂CH_{2Cl whereas Chlorine is the element Cl2 The vinegar-chlorine reactions have no source of sulfur.}

[El Laton Caliente]

Pretty sure fosgene is mustard gas.