An acetylene cylinder can become unstable and potentially explode if a flashback occurs, triggering decomposition of the acetylene gas inside. While an explosion may be rare immediately after a flashback, decomposition poses a danger as emergency responders may need to cool the cylinder for hours before it can be safely moved. Several precautions can be taken to prevent flashbacks, such as using proper lighting procedures, fitting flashback arresters, maintaining equipment, and receiving training on safe operating practices. However, if a flashback does occur, immediately shutting off the gas valves and evacuating the area is important for safety.