What does the pictogram of an exclamation mark signify on a label?

The pictogram of an exclamation mark on a label is specifically designed to alert users to the potential for irritation or allergic reactions from the substance. This symbol serves as a warning to those handling the material, indicating that it can cause non-lethal hazards such as skin or eye irritation and allergic reactions in some individuals. Awareness of these risks is essential for safe handling, providing an immediate visual cue to exercise caution and use appropriate protective measures, such as gloves or goggles.

Other options describe different hazards. For example, substances that are highly flammable would typically use a flame pictogram, while the need for storage in a cool place would be referenced in safety guidelines and not indicated by an exclamation mark. Lastly, a pictogram indicating a safe substance would not include an exclamation mark, which is rather cautional in nature. Understanding the meaning of these symbols is crucial in maintaining safety and preventing accidents in environments where hazardous materials are present.