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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