In the labeling system, what does the color red specifically indicate?

In the labeling system used for hazardous materials, the color red specifically indicates flammability hazard. A red label with a rating of 4 signifies a severe flammability hazard, meaning that the material can ignite easily and poses a significant risk of fire or explosion under standard conditions. Understanding the color code is crucial for identifying risks when handling, transporting, or storing chemicals, especially for applicators dealing with pesticides and other hazardous substances.

While other colors in the labeling system represent different hazards—such as blue for health hazards and yellow for instability—the emphasis on red as a direct indicator of severe flammability hazards highlights the urgency and danger associated with flammable materials. This differentiation is vital for ensuring proper precautions are taken to prevent accidents and ensure safety in the workplace.