Colorimetry is the science that measures and quantifies color. It involves using instruments, such as colorimeters, to determine the concentration of colored substances in a solution. This technique is widely used in various fields, including chemistry, biology, and environmental science, to analyze samples and ensure quality control. The fundamental principle of colorimetry is based on the absorption of light. When light passes through a colored solution, certain wavelengths are absorbed while others are transmitted. By measuring the intensity of the transmitted light, scientists can calculate the concentration of the colored compound, following the Beer-Lambert Law.