Which of the following is a sign of heat exposure on a ladder?

Heavy carbon deposits or blistered paint on a ladder are clear indicators of heat exposure. When a ladder is subjected to high temperatures, it can experience a range of physical changes, most notably in its paint and surface materials. The intense heat can cause the paint to blister, which signifies that the ladder has been exposed to dangerous thermal conditions. Additionally, heavy carbon deposits suggest that the ladder has been in close proximity to fire or intense heat, enabling the accumulation of soot and residue.

This is particularly concerning in firefighting situations, as compromised ladders may not provide the necessary safety or structural integrity required for use in emergencies. In contrast, bright, shiny paint, increased flexibility of the materials, and the presence of rust do not specifically indicate heat exposure, making them less relevant for assessing a ladder's condition after exposure to high temperatures. Thus, identifying blistered paint or carbon buildup is crucial for ensuring the reliability and safety of firefighting equipment.