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Heritage Science
Fig. 7 | Heritage Science

Fig. 7

From: The lightfastness of early synthetic organic dyes

Fig. 7

Example data for Hofmann’s Violet RRR on wool: a diffuse reflectance measured over white and black backgrounds. Thick lines are for 0 Mlx·h, and thin lines at 100 Mlx·h; b calculated CIELAB values versus light dose (D65/2°); c colour difference versus light dose

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