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Figure 10
Raman spectroscopy: identification of quinacridone. (a, b) Optical micrographs of patient 5's biopsy at two different magnifications [(a) 10× and (b) 100×] revealing the presence of micrometre-size red and white pigments, mixture of PR122 and TiO2. (c) Corresponding Raman spectra (top spectrum: no correction of the luminescence background; bottom spectrum: baseline corrected). Reference spectra are also given as comparison: PR122 C.I. 73915, Polycyclic pigment, Quinacridone from the Soprano spectral library, anatase (TiO2) downloaded from the RRUFF spectral library (ID R110109, 780 nm). (d, e) Optical micrographs of patient 8's biopsy at two different magnifications [(d) 10× and (e) 100×] revealing the presence of micrometre-size red pigments PR202. (f) Corresponding Raman spectra. Top spectrum is presented as collected (no correction of the luminescence background), bottom spectrum is baseline corrected and the spectral range adapted to highlight the signature of the red organic pigment. Reference spectra are also given as comparison: PR202 C.I. 73907, Polycyclic pigment, Quinacridone from the Soprano spectral library.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 6| November 2022| Pages 1436-1445
https://doi.org/10.1107/S1600577522008165
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