Colorimeter

A colorimeter is an instrument commonly used in foreign trade for color measurement and quality control. It quantifies color differences by simulating the human eye's response to the three primary colors (red, green, and blue). It is widely used in textiles, coatings, plastics, printing, and other industries. Compared with a spectrophotometer, a colorimeter typically provides only tristimulus values (such as L*a*b*) and has lower measurement accuracy and spectral resolution, but it is lower in cost and easier to operate, making it suitable for rapid comparison on production lines. In foreign trade, colorimeters are often used for: 1) comparing customer samples with finished product colors to ensure batch consistency; 2) serving as an objective inspection basis in quality clauses to avoid claims caused by color deviation; 3) issuing test reports in accordance with international standards such as CIE Lab and ISO 105-J03. Notes: measurement conditions (light source, observer angle, measurement aperture), instrument calibration status, and the color difference tolerance recognized by both parties (such as ΔE≤1.5) must be clearly specified. If the contract does not stipulate the colorimeter model or measurement method, disputes may arise. Therefore, it is recommended to state in the order that 'the measurement results of the colorimeter confirmed by both parties shall prevail' and to retain standard color plates.