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Heritage Science

Table 2 Upper and lower limits that define the change range for blue wool standards

From: Realizing sensations: analyzing Paul Cezanne’s watercolors and assessing their light sensitivity with microfade testing

 

Absolute Change (ΔE00)

Rate of Change \((\frac{\partial \Delta {E}_{00}}{\partial t})\)

BW1

4.5 ≤ ΔE00 ≥ 2.7

3.7 × 10–3 ≤ \(\frac{\partial \Delta {E}_{00}}{\partial t}\)  ≥ 2.0 × 10–3

BW2

2.7 ≤ ΔE00 ≥ 1.2

2.0 × 10–3 ≤ \(\frac{\partial \Delta {E}_{00}}{\partial t}\)  ≥ 7.0 × 10–4

BW3

1.2 ≤ ΔE00 ≥ 0.1

7.0 × 10–4 ≤ \(\frac{\partial \Delta {E}_{00}}{\partial t}\)  ≥ 1.2 × 10–4

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