Oxygen gas labeling color scheme should be which of the following?

• A. Green lettering on a white background
• B. Red lettering on a blue background
• C. White lettering on a green background
• D. Black lettering on a yellow background

Answer: (A)

Color coding on gas cylinder labels helps people identify gases quickly, which is vital for safe handling. Oxygen is identified with green text on a white label because green stands out and signals the oxygen/oxidizer family, while the white background provides strong contrast for easy reading in different lighting. This combination makes the label legible from a distance and under stress, aligning with common labeling conventions for oxygen. The other color pairings would either reduce readability or point to different substances or hazards, so they don’t meet the standard for oxygen labeling.