A common indicator of chemical stress in a container is:

Over-pressurization is a common indicator of chemical stress in a container because it signifies that internal reactions, such as chemical degradation or the generation of gases, are occurring. This might be due to a reaction between the contents or a reaction with the container materials themselves. When gases build up, they increase the internal pressure, which can lead to ruptures or leaks if the container's integrity is compromised.

In contrast, while contaminated surfaces, unusual odors, and temperature extremes can also suggest issues with hazardous materials, they are not direct indicators of the stress a container may be experiencing. For instance, contaminated surfaces might indicate a leak or spill without necessarily reflecting the internal conditions of the container. Similarly, unusual odors can result from various chemical reactions but do not specifically reveal the structural integrity of the container. Temperature extremes may imply that the container is not stored properly, but they do not specifically indicate internal pressure changes, which are crucial to assessing the state and safety of the container.