In what type of location is it dangerous to leave partially burned papers unattended?

Leaving partially burned papers unattended near an open flame is dangerous due to the risk of ignition and the potential for a fire to spread. When materials are close to a flame, they can easily catch fire, especially if they contain flammable substances or have not been completely burned. The heat and proximity to the flame can reignite the remaining combustible materials in the papers, leading to an uncontrolled fire.

In contrast, leaving these papers on a non-flammable surface, inside a closed container, or away from heat sources reduces the risk of igniting a fire. Non-flammable surfaces do not provide a conducive environment for fire spread, closed containers contain the materials and prevent airflow that could promote combustion, and being away from heat sources minimizes exposure to potential ignition points. Hence, leaving partially burned papers unattended near an open flame poses a significant fire hazard.