Umber

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Umber is a natural brown clay pigment which contains iron and manganese oxides. The colour becomes more intense when calcined (heated), and the resulting pigment is called burnt umber. Its name derives from the Latin word umbra (shadow) and was originally extracted in Umbria, a mountainous region of central Italy,[1] but it is found in many parts of the world. Some of the finest umber comes from Cyprus. It has been used as a pigment since prehistoric times.

Chemical formula: Fe2O3 + MnO2 + nH2O + Si + Al2O3

[edit] See also

[edit] References

  1. ^ Blick Art Materials, 00501-8054 — Burnt Umber

[edit] External links

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