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Fig. 5 | Heritage Science

Fig. 5

From: The lightfastness of early synthetic organic dyes

Fig. 5

a Light dose causing a colour change equal to ISO Grey Scale values 1–4 for ISO Blue Wools 1–4. Average values shown with 95% confidence intervals; b comparison of the dose causing a just-noticeable difference (GS4) for Blue Wools under the LED test illuminant, and values given in CIE 157 for BW response under a light source with and without UV

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