What is required on a hazard warning label according to OSHA guidelines?

The correct response is that a hazard warning label must include the manufacturer's telephone number as per OSHA guidelines. This requirement is critical because it provides a direct line of communication for employees and emergency responders who may need to obtain more information about potential hazards associated with a substance. In the event of an incident or exposure, having access to the manufacturer's contact information allows for timely and accurate information to be gathered, which can be essential for safety and compliance purposes.

The other options do not align with OSHA's specific requirements for hazard warning labels. A color-coded system might be part of an organization’s internal safety protocols but is not a mandated aspect of hazard labeling under OSHA. Price information is not relevant to safety labels; rather, they focus on hazard communication. Similarly, distribution channels are unrelated to the safety information that must be conveyed on hazard labels.