Which NFPA 704 color indicates special information (such as oxidizers or water-reactive properties)?

Which NFPA 704 color indicates special information (such as oxidizers or water-reactive properties)?

• A. Health (blue)
• B. Flammability (red)
• C. Reactivity (yellow)
• D. Special information (white)

Answer: (D)

White in the NFPA 704 diamond is reserved for special information. This area carries symbols or letters that flag extra hazards not covered by the blue (health), red (flammability), or yellow (reactivity) sections—examples include oxidizers (OX) and water-reactive materials (a W with a strike through). These notes alert you to take specific precautions, such as avoiding water with water-reactive substances or recognizing that an oxidizer can intensify fires. Other symbols in the white area may indicate additional cautions like acids, bases, or other site-specific hazards, guiding safe handling, storage, and response.

White in the NFPA 704 diamond is reserved for special information. This area carries symbols or letters that flag extra hazards not covered by the blue (health), red (flammability), or yellow (reactivity) sections—examples include oxidizers (OX) and water-reactive materials (a W with a strike through). These notes alert you to take specific precautions, such as avoiding water with water-reactive substances or recognizing that an oxidizer can intensify fires. Other symbols in the white area may indicate additional cautions like acids, bases, or other site-specific hazards, guiding safe handling, storage, and response.