Introduced in the 1860s, it was extensively used by the impressionists for its fairly true blue. It is still in use.
Manufacturer / product code: Kremer / 45730
Chemical description: cobalt stannate.
Color Index: PB35
More info: Pigments Through The Ages
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”