The GB/T 9761-2008 standard specifies a visual colorimetric method for Paints and varnish film Color. This standard applies to comparing the Color of Paints film with standard samples and can be performed under natural daylight or artificial Light sources (Color Assessment Cabinet). When colorimetric, strict lighting and observation conditions are followed to ensure the accuracy and Repeatability of Colorimetric. The standard requires that observers with normal color vision are selected and Colorimetric is performed under appropriate lighting conditions, such as using CIE standard illuminator 065 or CIE standard illuminator A. In addition, this standard also specifies the selection and processing methods of the test plate and the reference standard plate, as well as detailed steps such as the determination of film thickness to ensure conformity and Reliability in the Colorimetric process.