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See Chinese contents: GB/T 40969-2021 GB/T 40969-2021: Paper and board -- Determination of colour (D50/2° diffuse reflectance method)
This document describes a method for determining the color of paper and cardboard by the diffuse reflectance method with the elimination of gloss. This document applies to paper and cardboard for printing. When the amount of ultraviolet radiation irradiated by the light source of the instrument on the sample is adjusted to be consistent with the fluorescence reference standard under CIE illuminant C provided by the authorized laboratory specified in GB/T 40277, this method can be used for the determination of the color of paper and cardboard that contains fluorescent whitening. This document does not apply to paper and cardboard to which fluorescent dyes or color dyes have been added.
