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Heritage Science

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

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