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 Index: PY 43
DOWNLOAD paper: “Pigments Checker version 3.0, a handy set for conservation scientists: A free online Raman spectra database”
DOWNLOAD paper: “FORS spectral database of historical pigments in different binders”