Aidan wrote: ...Could you do that experiment with the corn flour in a dunnage warehouse where whisky is stored?
I assume the wharehouse man would bodily eject anyone trying to set it up.
I know that here we had a 5 Roses flour mill at one time which burnt down very spectacularly in the 60's, in part due to the amount of flour dust accumulation. Also, that workers that swept out the grain silos in Fort William had to be careful about static electricity and the concern of wearing a mask against grain dust and the added risk of possible silicosis later in life.
Industrial areas that are prone to dust accumulation of any sort can be hazardous worksites. The video was pretty interesting and very illustrative of this fact, so don't try it at home.