what is the qualified range of the national standard color difference of pigment pastes?

according to the “chemical industry standard of the people’s republic of china” (hg/t 3951-2007), the color difference of pigment pastes is determined by visual inspection and instrumentation. the specific standards are as follows:
1. dark color (1:1 dilution or agreed upon)
visual or instrumental method
ordinary color paste: approximate~micro δe ≤ 1.0; approximate δe ≤ 0.5 for tinting machine;

2. light color (1:25 diluted or agreed upon)
visual or instrumental method
ordinary color paste: approximate~micro δe ≤ 0.8; approximate δe ≤ 0.5 for tinting machine;

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