Primary container labels of hazardous chemicals must contain one of two signal words. What are these signal words?

The correct answer is that primary container labels of hazardous chemicals must contain the signal words "Danger" and "Warning." These terms are critical in communicating the level of hazard associated with the materials contained within the package.

"Danger" is used for more severe hazards, indicating a high level of risk that can result in serious injury or death. It signals that the contained chemical is highly hazardous and requires immediate attention or precautions when handling.

"Warning," on the other hand, denotes a less severe but still significant level of hazard. It implies that while the risks are serious, they may not be as extreme as those indicated with "Danger." Using these signal words helps ensure that individuals handling hazardous chemicals are aware of the potential risks and can take appropriate safety measures.

Having a clear understanding of these signal words is essential for promoting safety in environments where hazardous materials are present, which is a core principle of hazardous waste operations.