Cetrimide Agar serves as a selective medium for isolating and identifying Pseudomonas aeruginosa, suppressing the growth of other microorganisms while allowing P. aeruginosa to thrive. This bacterium produces pyocyanin, a distinctive blue, water-soluble, nonfluorescent pigment, along with a recognizable odor. The medium is commonly used in testing cosmetics, clinical samples, and non-sterile pharmaceuticals, as well as assessing disinfectant effectiveness. Its primary role remains the selective detection of Pseudomonas aeruginosa.