Fig. 2
From: Shine a light on papyrus: monitoring the aging process
CIELAB measurements of papyri and cotton linter samples aged with and without the influence of light. a Comparison of Delta E for papyrus and cotton linter samples aged with and without light, b Delta values for light-aged papyrus samples, c Color changes for light-aged papyrus—expressed as difference in L*, a*, and b* and Delta E for comparison, d ISO-brightness for papyrus samples aged with and without light influence. Error bars indicate the standard deviation of nine measurements per time step for the CIELAB measurements