Which of the following assists in identifying the contents of a compressed gas cylinder?

The identification of the contents of a compressed gas cylinder is primarily supported by the stenciled type of gas that is marked directly on the cylinder itself. This stenciling provides a clear and immediate visual indication of what gas is contained within the cylinder, ensuring that personnel can quickly ascertain the type of gas they are working with, which is crucial for both safety and operational purposes.

While tracking logs and the manufacturer's manual can provide important information about the use and maintenance of the cylinder, they are not the fastest methods for identifying the specific contents in an urgent scenario. The color of the label can provide additional context; however, the stenciling offers the most direct and well-established protocol for identification. Thus, relying on the stenciled type of gas ensures compliance with safety standards and minimizes the risk of mishandling potentially hazardous materials.