sienna


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sienna:

see ocherocher
, mixture of varying proportions of iron oxide and clay, used as a pigment. It occurs naturally as yellow ocher (yellow or yellow-brown in color), the iron oxide being limonite, or as red ocher, the iron oxide being hematite.
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sienna

[sī′en·ə]
(materials)
Any of various yellowish-brown earthy substances consisting of hydrated iron oxide occurring in limonite; becomes orange-brown when burnt and is generally darker and more transparent in oils than is ocher; used as pigment for oil paints and stains.

sienna

A naturally occurring pigment, chiefly oxides of iron; yellow-brown when mined. When calcined, a dark, rich color; then called burnt sienna.

sienna

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. the colour of this pigment
References in periodicals archive ?
Sienna introduces a new mix of content into the company, laying a foundation for continued scripted growth.
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Sienna rang her dad but got no answer so - remembering what her parents had taught her - called the emergency number.
Mark Gilbert, CTO at Gallery SIENNA said: "We are delighted that MGI has made a strong commitment to Sienna, and MGI's experience and reach will make Sienna accessible to a new audience in the Gulf region.
I was heartbroken when doctors said Sienna may be bedbound and unable to walk or talk.
The twins' mum Chrissy revealed how the girls were born three months premature and doctors gave tiny Sienna - who weighed just a pound - little chance of survival.
Jude Law apparently spent Au140,000 buying girlfriend Sienna Miller a grand piano and a ring for Christmas, fuelling rumours the showbiz couple plan to marry in the new year.
But they realised it wasn't going to last the distance with Sienna being out in New York with the play for the foreseeable future, so they agreed to part ways.