A clay of limonite rich in iron oxide is the source of raw sienna andburntsienna.
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When heated, it becomes a reddish brown and is calledburntsienna.
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From volume 25 (1964) onwards, all volumes have been published in a uniformburntsiennahardback binding.
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The embryonic whorls areburntsiennabrown (weathering to whitish in adult shells), or sometimes there is a light median zone.
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