What labeling color is associated with a Class B fire extinguisher?

The labeling color associated with a Class B fire extinguisher is a red square. Class B fires involve flammable liquids, gases, and greases, such as petroleum products and solvents. The red square on the label indicates the extinguisher is suitable for use on these types of fires, distinguishing it clearly from other classes of fires which require different types of extinguishing agents. Using the wrong type of fire extinguisher can be ineffective or even dangerous, making it crucial for first responders and users to recognize the labeling color and shape specifically designated for Class B extinguishers.