There's a type of salt that can set fire to ice.
In 1984, scientists at the University of Utah discovered that a type of rock salt called "antimony sulfide" can ignite when mixed with ice. This phenomenon occurs because the salt lowers the freezing point of water, allowing it to remain in a liquid state even below 0°C (32°F). When the liquid water comes into contact with oxygen, it can spontaneously combust, setting the ice ablaze. This reaction is known as a "self-sustaining combustion" and is a rare example of a fire that can start without an external heat source.