How must we “identify” a fire extinguisher, e.g., signs, markings, color, etc.?

According to 1910.157(c)(1), employers must provide portable fire extinguishers and mount, locate, and identify them so that they are readily accessible to employees without subjecting the employees to possible injury. OSHA does not state how employers must identify fire extinguishers. Whatever method is used, employees who are expected to use the fire extinguisher must understand how the fire extinguishers are identified. Signs or wall, post, or floor paint or tape are popular methods. While any color identifier is acceptable, red is the basic color for identification of fire protection equipment and apparatus, according to 1910.144. It should be noted that ANSI Z535.2 recommends specifications for sign format and colors for fire extinguisher location signs.