Which color on the NFPA 704 fire diamond indicates instability/ Reactivity?

Which color on the NFPA 704 fire diamond indicates instability/ Reactivity?

• A. Red
• B. Blue
• C. Yellow
• D. White

Answer: (C)

NFPA 704 uses a color-coded diamond to show hazards at a glance. Blue denotes health risk, Red denotes flammability, Yellow denotes reactivity (instability), and White covers special hazards. The color that indicates instability/reactivity is the yellow section. The numbers in that area (0–4) express how reactive the material is, with higher numbers signaling greater potential for dangerous reactions (with heat, water, shock, etc.). The other colors don’t describe reactivity: blue is about health effects, red about flammability, and white for special hazards like oxidizers or water reactivity.

NFPA 704 uses a color-coded diamond to show hazards at a glance. Blue denotes health risk, Red denotes flammability, Yellow denotes reactivity (instability), and White covers special hazards. The color that indicates instability/reactivity is the yellow section. The numbers in that area (0–4) express how reactive the material is, with higher numbers signaling greater potential for dangerous reactions (with heat, water, shock, etc.). The other colors don’t describe reactivity: blue is about health effects, red about flammability, and white for special hazards like oxidizers or water reactivity.