What color indicates a flammable gas cylinder according to safety standards?

The color that indicates a flammable gas cylinder according to safety standards is yellow. This designation is primarily used to warn individuals that the contents of the cylinder pose a fire hazard due to their flammability. The use of yellow facilitates quick identification of potential dangers in environments where various gases may be present, ensuring that proper precautions can be taken. Color coding is a critical element in safety protocols, as it visually communicates important safety information to workers and emergency responders, ensuring that they can easily recognize and handle hazardous materials appropriately.