Which of the following colors indicates a specific hazard in the NFPA 704 system?

In the NFPA 704 system, which is used to communicate the hazards associated with materials, each color on the diamond-shaped placard represents a different type of hazard. The white section of the NFPA diamond is specifically used to denote specific hazards that are not covered by the other colors. This area can include symbols that specify hazards such as radiation or acid reactivity.

The blue color indicates health hazards, the red color signifies flammability, and yellow signifies reactivity. Each of these colors is critical for understanding an immediate danger, but the white area provides additional details about hazards that require special consideration beyond the general categories of health, flammability, and reactivity. Therefore, the white color's role in indicating specific hazards is crucial for ensuring the safety of first responders and those handling hazardous materials.