Which sense can be safely used to identify a hazardous material?

Using sight to identify hazardous materials is a safe approach because it allows responders to observe signs and indicators without direct contact with potentially dangerous substances. Through visual assessments, one can identify labels, placards, or discrepancies in the material's appearance, which may provide clues about its identity and any associated hazards. For example, unusual colors, corrosion, or leaks may signal the presence of hazardous materials.

In contrast, using touch or taste poses significant risks. Touching a substance could result in skin exposure or contamination, while tasting a material could have fatal consequences. Smelling a substance is also dangerous, as many chemicals can be harmful or lethal upon inhalation, and they may not have a noticeable odor until it is too late. Thus, relying on sight is a practical and safe method for identifying hazardous materials during response operations.