An Infectious Substances hazard is indicated by which placard color?

An Infectious Substances hazard is indicated by which placard color?

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

Answer: (A)

Infectious substances carry a white placard to provide a clear, universal warning of a biological hazard. The white background is used specifically for the biohazard indication, making the symbol highly visible and distinct from other hazard-class colors. This visual distinction helps responders and handlers recognize Class 6.2 shipments quickly, regardless of the transport mode. Other color schemes are reserved for different hazard classes (for example, red or orange for various flammable or reactive hazards), so using white for infectious substances avoids confusion and aligns with international transport rules (IATA/ICAO, DOT/49 CFR).

Infectious substances carry a white placard to provide a clear, universal warning of a biological hazard. The white background is used specifically for the biohazard indication, making the symbol highly visible and distinct from other hazard-class colors. This visual distinction helps responders and handlers recognize Class 6.2 shipments quickly, regardless of the transport mode. Other color schemes are reserved for different hazard classes (for example, red or orange for various flammable or reactive hazards), so using white for infectious substances avoids confusion and aligns with international transport rules (IATA/ICAO, DOT/49 CFR).