My wife and I are first responders and one of our duties is to respond to house fires to monitor the fire fighters for B.P. dehydration etc. We responded to a house fire recently and just learned the cause of the fire today. It started outside the home in a pile of rags that had been used by "professionals?" to apply a linseed oil finish to cabinets in the redone kitchen. The rags were piled next to the house, caught fire and the fire went up the cedar siding, thru the soffit and into the attic , where it spread taking out about 40% of the house. The house was not occupied and no fire fighters were hurt and the fire did not spread to other nearby houses.
This is not urban legend but straight up true story, Moral to this is be very careful with those finishing rags.
Russ