Burnt umber

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Burnt umber (Fe₂O₃+MnO₂+clay) from Sennelier and Winsor&Newton.

ATR-FT-IR spectrum of Burnt umber from Sennelier (4000-225 cm^–1)

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ATR-FT-IR spectrum of Burnt umber from Winsor&Newton (4000-225 cm^–1)

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