Table 1 Paint stratigraphy samples. Pigment density, observed through optical microscopy, is categorized as l = low, m = medium or h = high, for each type of pigment: L = lead red, Vi = viridian, U = ultramarine, Ve = vermilion and C = chrome yellow. The average diameter of the crystals, in micrometers, is indicated in parenthesis next to the pigment symbols. Analysis symbology: OM = optical microscopy, R = Raman spectroscopy, EDX = energy dispersive X ray spectroscopy, UV = fluorescence microscopy and FTIR-ATR = Fourier transform infrared - attenuated total reflectance spectroscopy. For FTIR-ATR analysis, samples were not embedded. The rest of the analyses were carried out on cross-sections of samples.
Painting | Sample name | Visible colour | Grid location | Pigments density | Crystal average diameter (\(\upmu m\)) | Analysis |
|---|---|---|---|---|---|---|
Musas I | M1-45B | Dark blue | 45 | Layer 1: Ve(h), U(m), C(m) | Ve(4.7), U(2.0), C(1.2) | MO, R, EDX |
Layer 2: C(m), U(m) | ||||||
M1-54P | Pink | 54 | Layer 1: Ve(m), L(l) | Ve(1.4), L(21) | MO, R | |
M1-54R | Red | 54 | Layer 1: Ve(h), C(m) | MO, R, SEM, UV | ||
M1-58W | White | 58 | Layer 1: C(l) | MO, R, EDX | ||
M1-60W | White | 60 | Layer 1: C(l) | MO, R | ||
Layer 2: U(l), C(l) | ||||||
M1-75W | White | 75 | Layer 1: Ve(l), C(l) | C(7.7), U(3.4) | MO, R, SEM, EDX, FTIR-ATR, UV | |
Layer 2: C(h), U(m) | ||||||
Musas II | M2-27B | Light blue | 27 | Layer 1: U(m) | MO, R, UV | |
Layer 2: U(m), C(m) | ||||||
M2-31W | White | 31 | Layer 1: Ve(l) | MO, R, EDX, FTIR-ATR, UV | ||
Layer 2: U(h), C(h) | ||||||
M2-33Br | Brown | 33 | Layer 1: Ve(m), U(l), C(l) | MO, R, EDX, UV | ||
Layer 2: U(m), C(m) | ||||||
M2-39B | Dark blue | 39 | Layer 1: U(m), C(m), Ve(l) | U(4.7), C(1.4), Ve(2.3) | MO, R, EDX, UV | |
M2-63W | White | 63 | Layer 1: C(h), U(h) | R | ||
M2-69P | Pink | 69 | Layer 1: Vi(l), Ve(l),L(l), U(l),C(l) | Vi(5.1), Ve(3.0), L(0.6), U(2.5), C(0.6) | MO, R | |
M2-70L | Light purple | 70 | Layer 1: Ve(m), U(m), C(l) | R | ||
Layer 2: C(h), U(h) | ||||||
M2-73Br | Brown | 73 | Layer 1: U(m), C(m) | C(4.8), U(4.13) | MO, R | |
Layer 2: U(m), C(m) | ||||||
M2-83Br | Brown | 83 | FTIR-ATR |
