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 ?
Using the same flat brush and Naples yellow with a touch of raw sienna, I filled in the foreground field and then, with more raw sienna, added a few diagonal stripes coming across it.
For both the raw sienna and burnt umber glazes, try to find liquid flow acrylic paints, which are easier to work with, and mix one part paint to four parts transparent glaze.
Mix 1/2 pint white paint with 2 tablespoons raw sienna acrylic and 1 tablespoon water.
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.
Pigments offered: Blacks )black/gray, complex inorganic, carbon black, lamp black); Blues (complex inorganic, ultramarine); Extender pigments (barium sulphate); Greens (chromium, complex inorganic); Iron Oxide pigments (black, burnt umber, raw sienna, Yellow/Red/Brown natural and synthetic, burnt sienna, metallic brown, ochre, raw umber, van dyke brown); Yellow and Oranges (yellow/orange, complex inorganic).