That stuff is innocuous next to what fighters use in the event of a flame-out. Hydrazine I think it is and what's said of it is if an amount smaller even than a pin head contacts skin. cancer will ensue. Not maybe, but will.
The MOD and RAF never answer questions as to its use but it's known that pilots practice relighting flamed-out engines in flight. Over land or water I wouldn't know but safe to assume that an amount no matter how small escapes to atmosphere during the process before ignition is achieved.
