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A fire can be extinguished with diesel (jet fuel is pretty much just cleaner diesel / kerosene) in cold conditions, I know because I’ve done it.

It takes a fair amount of heat / pressure to ignite jet fuel, easier if it’s vaporised.

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Why were you trying to extinguish a fire using diesel?

I would guess they were not trying to extinguish a fire with diesel and accidentally learned you could.

Indeed. It was about 0 degree Celsius, camping and we were trying to get a bit of a fire going for heat. I won't do that with petrol as I value my eyebrows, ended up having to thin the diesel a bit with petrol as we discovered splashing diesel on a small flame on damp wood doesn't help at all.

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