GB/T 40969-2021 "Paper and board—Determination of colour (D50/2° diffuse reflection method)" is applicable to the determination of colour for various types of paper and board. It adopts the diffuse reflection method with the D50 standard illuminant and the 2° standard observer, clearly defines the terminology for colour measurement, and specifies the instrument requirements. The standard regulates sample handling, measurement conditions, and the presentation of results, reflecting the colour characteristics of paper through relevant chromaticity parameters to ensure consistency in colour determination.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | Y 30 | ICS | 85.060 |
| Release Date | 2021-11-26 00:00:00 | Implementation Date | 2022-06-01 00:00:00 |
