The morning after the night before: campfires revisited.

Med J Aust · 2003

Where this comes from

Abstract

Even eight hours after a campfire has been extinguished with sand, it retains sufficient heat to cause a full-thickness burn with contact of one second. Because extinguishing with sand disguises the danger, this is a particular hazard for children. The only safe way to extinguish a campfire is with water.