Which color does not have a numeric value on the NFPA scale?

Which color does not have a numeric value on the NFPA scale?

• A. Blue, health
• B. Red, flammability
• C. Yellow, reactivity
• D. White, special hazards

Answer: (D)

NFPA 704 diamonds use colored sections to show different kinds of hazard. The blue, red, and yellow sections each carry a number from 0 to 4 that represents how severe the health, flammability, and reactivity hazards are. The white section, though, is set aside for special hazards and does not use a numeric rating. Instead, it uses letters or symbols (like OX for oxidizers, W with a line through it for water reactivity, or indicators for acids, bases, or when a material has a specific hazard that isn’t captured by the numbers). Because there’s no 0–4 scale in the white section, it’s the color without a numeric value on the NFPA scale.

NFPA 704 diamonds use colored sections to show different kinds of hazard. The blue, red, and yellow sections each carry a number from 0 to 4 that represents how severe the health, flammability, and reactivity hazards are. The white section, though, is set aside for special hazards and does not use a numeric rating. Instead, it uses letters or symbols (like OX for oxidizers, W with a line through it for water reactivity, or indicators for acids, bases, or when a material has a specific hazard that isn’t captured by the numbers). Because there’s no 0–4 scale in the white section, it’s the color without a numeric value on the NFPA scale.