ISO 7724-3 Paints and Varnishes - Colorimetry - Calculation of Color Differences

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 7724-3 testing. This standard describes a method for the quantitative colorimetric assessment of minor differences between paint films.

The CIE 1976 color difference formula proposed by the CIE in 1976 has proven to be of practical value and is specified for this application. The principle is based on calculating the color, lightness, chroma and hue differences between the paint films of a test sample and a reference sample in the CIE 1976 color space. If the two methods mentioned are performed, comparable results are obtained for high gloss paint films.

Calculate the color, lightness, chroma and hue differences between the paint films of a test sample and the reference sample from color coordinates in the CIE 1976 color space. If the color difference between the test sample and the reference sample is to be determined solely due to the color difference of the coloring material, the color coordinates should be calculated from the measured tristimulus values, including specular reflection, as described.

With modern instruments it is absolutely not necessary to calculate the coordinates of the test samples, as the color difference is automatically calculated from the reference values ​​stored in the instrument.

EUROLAB assists manufacturers with ISO 7724-3 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.