Which of the following is essential to include in a warning label for a hazardous product?

Including appropriate warnings on a label for a hazardous product is crucial because these warnings communicate the potential risks associated with the product's use. They provide essential information that helps users understand hazards they may encounter, such as toxicity, flammability, or environmental impact. Warnings can inform users about necessary precautions to take to protect themselves and others during handling, storage, and use.

For instance, if a product is corrosive or poses a risk of causing irritation upon contact, a clear warning can prevent accidents or injuries. This requirement is not just about safety; it is often mandated by regulatory bodies to ensure that consumers have the information necessary to use the product safely and responsibly.

In contrast, details like expiry dates and promotional messages are generally not as critical for safety and may not provide the specific instructions needed to handle hazardous materials appropriately. Safe disposal instructions, while important, are part of the broader category of appropriate warnings but may not cover all immediate hazards related to the surface-level usage of the product. Thus, having appropriate warnings at the forefront is essential for maintaining safety standards.