What does the color "Red" indicate on an NFPA hazard sign?

The NFPA hazard sign uses a color-coded system to provide quick visual indicators of potential hazards associated with materials. The color red specifically represents flammability. This color alerts responders and personnel that the material can easily ignite and poses a fire risk, which is critical information for safety and emergency response procedures. Understanding this system is essential for anyone handling hazardous materials, as it helps them assess the risks associated with different substances at a glance.

In the context of the other options, while reactivity, corrosiveness, and health risk are also important aspects of hazard identification, they are represented by different colors on the NFPA sign. Blue is used for health risk, yellow for reactivity, and white can indicate specific hazards or corrosiveness, thus making red uniquely significant for indicating flammability.