Which of the following is one of the four steps to hazard recognition?

• A. Pictograms
• B. Background color
• C. Hazard class number
• D. UN/NA identification number

Answer: (B)

Hazard recognition relies on quick, visual cues you can process in an instant. The background color of a label is a key part of that rapid assessment because color coding is designed to signal the broad hazard category at a glance. Seeing the color level tells you whether the material is, for example, a flammable, toxic, corrosive, or reactive hazard, which helps you decide on immediate protective actions even before you interpret specific symbols or read numbers.

Pictograms and numbers provide more precise identification, but they require more interpretation and time. The background color starts the recognition process by giving an at-a-glance cue, which is why it’s considered one of the steps in hazard recognition. The specific hazard class number and the UN/NA identification number are detailed identifiers that you look up later to confirm exact classification and find handling requirements.