Fig. 11: The impact of EB phases on color perception values.
From: Assessment of process variability and color in synthesized and ancient Egyptian blue pigments
X-axes in the plots are wt.% from XRD Rietveld analysis. a addition of cuprorivaite on b* and a*. b Visible light image of EB cartonnage artifact, and SEM-EDS false color composite image, where red represents- Ca, green- Cu, and blue- Si. c The sum of all polymorphs of silica on a*. d addition of tenorite on L*. e addition of wollastonite on b* and a*. f simulated color swatches for MR2 (as measured) and experimental residual glass (which was 15 wt.% of the overall MR2 phase assemblage). Note: The qualitative nature of the color shift with addition of a phase is indicated by one or more blue or green arrows (except d) where L* values are a measure of light and dark intensities within the plots. Additionally, selected simulated color swatches from Table 3 are displayed for reference along first or second order regressions of the data.
