The traditional source of siennas have been the quarries near Siena in Italy.
Manufacturer / product code: Kremer / 40430
Chemical description: made by calcining Italian raw sienna. Calcined iron oxide and hydrated iron oxide Kremer PDF
Color Index: PR101
More info: Colourlex
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”