Which placard color is used to indicate a flammability hazard?

The color red is used to indicate a flammability hazard in the system of placarding. This color designation helps first responders and others quickly identify the presence of materials that can ignite and burn, which is crucial during emergencies. Red as a warning color is universally recognized, and its use in this context is aimed at ensuring safety by alerting personnel to the potential fire risks associated with certain materials.

In hazardous material response protocols, being able to swiftly interpret placard colors enables firefighters and emergency response teams to assess threats effectively and take the necessary precautions when dealing with flammable substances.