Used primarily in water and wastewater analysis to determine color intensity. The solution serves as a reference standard in visual and instrumental color comparison methods. It is essential in industries such as drinking water treatment, pharmaceuticals, and food and beverage production where water clarity and color are critical quality parameters. Laboratories use it to calibrate spectrophotometers and colorimeters, ensuring accurate and consistent measurement of sample color against the platinum-cobalt scale. Also employed in environmental monitoring and regulatory compliance testing to meet standards for color in effluents and potable water.