How many colors are used in the NFPA 704 diamond?

How many colors are used in the NFPA 704 diamond?

• A. Three
• B. Four
• C. Five
• D. Two

Answer: (B)

Four color fields are used in the NFPA 704 diamond. Each color signals a different hazard dimension: blue denotes health, red denotes flammability, yellow denotes reactivity, and white indicates special hazards. Because there are four distinct color areas, the count is four. The other options don’t fit because three or two colors would miss one or more hazard dimensions, and five isn’t part of the standard system. The white field carries specific hazard information (like oxidizers or water reactivity), so it’s an essential part of the four-color scheme.

Four color fields are used in the NFPA 704 diamond. Each color signals a different hazard dimension: blue denotes health, red denotes flammability, yellow denotes reactivity, and white indicates special hazards. Because there are four distinct color areas, the count is four. The other options don’t fit because three or two colors would miss one or more hazard dimensions, and five isn’t part of the standard system. The white field carries specific hazard information (like oxidizers or water reactivity), so it’s an essential part of the four-color scheme.