sienna

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Related to raw sienna: raw umber

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 ?
I add cobalt blue from the top, running just into the raw sienna, before quickly washing out the brush and 'sucking' out a few clouds before adding a little light red into the blue and popping this into the base of the clouds for shadow.
The colours were new to him' alizarin crimson, raw sienna and a green he couldn't pronounce.
Genesis Artist Colors stay wet indefinitely until heated and now have 83 colors available, including five new colors: Mars Black, Genesis Yellow, Raw Sienna, Genesis Metallic Silver and Genesis Metallic Gold.