What it is
Gas bleaching that ages and whitens flour in minutes — and a cautionary tale. Its predecessor, "Agene," was used on most white flour until it was pulled.
Why your biology objects
Agene (nitrogen trichloride) reacted with the flour's methionine to form a neurotoxin that gave dogs running fits, and was withdrawn around 1949 once that was understood — a textbook case of an additive ruled safe until it wasn't. Chemical flour bleaching is banned in the EU today.