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Raw sienna
Used from antiquity, sienna is compatible with all other pigments and is often used in mixture with several other pigments.
Manufacturer / product code: Kremer / 17050
Chemical description: iron oxides. brown earth from a site near Grosseto, Italy. Kremer PDF
Color: brown
Color Index: PY 43
Raman spectroscopy
Pigments (powder, no binder)

Raman Spectroscopy 785 nm Pigments (pure, no binder) (65891 downloads )
Pigments with acrylic binder (Pigments Checker)

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Pure pigments (no binder, just powder)
DOWNLOAD paper: “Pigments Checker version 3.0, a handy set for conservation scientists: A free online Raman spectra database”
Raman spectroscopy 830 nm
Pigments (powder, no binder)
Raman Spectroscopy 830 nm Pigments-Checker Database (53391 downloads )
XRF spectroscopy
XRF Spectroscopy Pigments-Checker Database (75129 downloads )
DOWNLOAD previous database from Pigments Checker V.3 DOWNLOAD paper: R. Larsen, N. Coluzzi, A. Cosentino “Free XRF Spectroscopy database of Pigments Checker” Intl Journal of Conservation Science.

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Reflectance spectroscopy -Gorgias spectrometer for Art
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NIR Reflectance spectroscopy
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FT-IR Spectroscopy (Non-invasive Diffuse Reflectance Probe)

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