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Umbra


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A painted swatch of Umbra:


About the chemical structure:

Chemical name: Iron(III)-oxide containing manganese(IV)-oxide
Formula: Fe2O3 · MnO2
Refractive index: n/a

How can you identify Umbra?

Chemical identification:

n/a

Spectra:

Usage and handling:

Permanence: Toxicity:
excellent non toxic

Literature:

Eisenoxidpigmente (at Pigmentlexikon by Th. Seilnacht)

Other browns
(intro) - Brown ochre - Umbra - Van Dyke brown        

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