raw sienna

See under sienna ( def 1 ).


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a ferruginous earth used as a yellowish-brown pigment (raw sienna) or, after roasting in a furnace, as a reddish-brown pigment (burnt sienna)
the color of such a pigment.

1750–60; < Italian (terra di) Sien(n)a (earth of) Siena

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World English Dictionary
sienna (sɪˈɛnə)
1.  a natural earth containing ferric oxide used as a yellowish-brown pigment when untreated (raw sienna) or a reddish-brown pigment when roasted (burnt sienna)
2.  See also burnt sienna the colour of this pigment
[C18: from Italian terra di Siena earth of Siena]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1760, from It. terra di Sienna "earth of Siena," city in central Italy, where the coloring material was first produced. The city name probably is from Senones, the name of a Gaulish people who settled there in ancient times.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
After inexplicably being denied the use of other colors, he began to apply thinned, raw sienna oil paint directly to plaster.
If stamens appear they will require cadmium, shaded with raw umber and raw sienna.
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