But ClF3 is harmless compared to dimethyl mercury (which he also goes into) -- and which the USAF contemplated as a reaction mass for air to air missiles, until

But ClF3 is harmless compared to dimethyl mercury (which he also goes into) -- and which the USAF contemplated as a reaction mass for air to air missiles, until they realized the mercury in the exhaust plume would melt their launch aircraft wings (not to mention being a potent neurotoxin), at which point they tried to sell it to the US Navy!