About Sienna
Sienna, #a0522d, is earth from the hills around Siena, Tuscany — iron-rich clay that gave painting two of its oldest workhorses: raw sienna (yellow-brown) and burnt sienna (the redder roast). It is one of the few colors that is literally a place.
History
Renaissance workshops ground Sienese earth beside their ultramarine; every traditional palette since lists the pair of siennas. The city’s own bricks — the Palio square glows with them — are the color’s permanent exhibition.
Psychology
Sienna is warmth with age — hearth, leather and pottery. Redder than tan, softer than rust, it reads artisanal and Mediterranean at once.
In design
Burnt sienna is a text-capable warm brown (#8a3b12-class passes AA); raw sienna warms backgrounds and illustration. Pair with cream, olive, terracotta and deep teal. Skin-tone illustration leans on sienna’s family constantly.
In culture
Siena’s Palio, sienna crayons, the “burnt” prefix every child learns: the Tuscan hillside is in art boxes worldwide — geology as brand.