When identifying propane cylinders, you should rely on which of the following rather than color alone?

• A. Cylinders color is the most reliable indicator.
• B. Labels, markings, and manufacturer specifications.
• C. Cylinder shape alone.
• D. Valve type alone.

Answer: (B)

When identifying propane cylinders, rely on the official labels, markings, and manufacturer specifications rather than color alone. Labels provide the exact gas name, hazard information, and content details, while the stamped markings show regulatory compliance, the manufacturer, service pressure, and hydrostatic test date. These identifiers are standardized and regularly updated, giving a reliable confirmation of what’s inside and how the cylinder should be handled. Colors can be misleading because a cylinder may be repainted, different manufacturers use different color schemes, or the color may fade or vary by region. Cylinder shape or valve type alone can't confirm content because those features can vary between sizes or be swapped or altered over time. In short, the safest and most accurate way to identify propane cylinders is to read and verify the labels, markings, and manufacturer specifications.