What is the purpose of the white section in the NFPA 704 diamond?

• A. It shows health hazards.
• B. It identifies special hazards.
• C. It shows flammability.
• D. It shows reactivity.

Answer: (B)

The main idea here is how the NFPA 704 diamond communicates hazards. The diamond uses three colored sections to show how dangerous a material is in health (blue), flammability (red), and reactivity (yellow), each with a number from 0 to 4. The white section, separate from those numbers, is reserved for special hazards—information that doesn’t fit into a numeric scale but is crucial for safe handling and emergency response. This is where you’ll see codes or letters indicating things like water reactivity, oxidation hazards, or other special conditions that affect how you should interact with the material. Because of that, the white area’s purpose is to identify these special hazards. The other colored sections cover the standard numeric ratings for health, flammability, and reactivity, which is why they aren’t describing “special hazards.”