Chemical hazard sign is indicated by which color and lettering?

• A. Blue sign red letters
• B. White sign black letters
• C. Red sign black letters
• D. Yellow sign red letters

Answer: (D)

Sign color coding and lettering communicate hazard recognition quickly. A yellow background signals caution, and red lettering adds urgency and danger, making a chemical hazard sign hard to miss. This combination is used to alert personnel to chemical hazards and prompt protective actions, such as using appropriate PPE and following proper handling procedures. The other color-letter pairings don’t convey the same immediate warning emphasis for chemical hazards in this context, so the yellow sign with red letters is the most effective choice.