What colors define class 6 placards?

Answer: C — White

Class 6 placards are designated for toxic substances and infectious substances, which are represented by the color white. This color coding is essential for easy identification of hazardous materials during transport, ensuring that responders and the public can recognize the potential risks associated with these materials. The use of a distinct color like white helps to effectively communicate the nature of the hazard, in compliance with the regulations set forth by the Department of Transportation and international standards for hazardous materials transport. Understanding the significance of color in placarding is crucial for safety and emergency response protocols.