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Table 1 Comparison of ISO Grey Scale ratings with CIE colour difference values from Hoban

From: The lightfastness of early synthetic organic dyes

Grey Scale Rating ∆E76
5 0 ± 0.2
4–5 (4.5) 0.8 ± 0.2
4 1.7 ± 0.3
3–4 (3.5) 2.5 ± 0.3
3 3.4 ± 0.4
2–3 (2.5) 4.8 ± 0.5
2 6.8 ± 0.6
1–2 (1.5) 9.6 ± 0.7
1 13.6 ± 1.0