Burnt Sienna

Colour: Burnt Sienna
Permanentness: AA
Opacity: Opaque
Pigment: PBk11, PR101, PY42
Pigment description: Black Iron Oxide, Red Iron Oxide, Yellow Iron Oxide
ASTM Lightfastness classification: I
Pigment classification: Mixture
Color Index Number: -
Viscosity range (mPa.s): 800 - 1,500

Color Index
The pigments used are both inorganic and organic. The inorganic ones have been used since antiquity and the vast majority come from or are extracted from minerals and clays, such as natural earths, siennas, and ochres. Titanium, carbon, ultramarine blue, cobalt and cadmium pigments also belong to this category. Many of them are currently synthesised in industrial processes. Organic pigments are more modern; they were developed at the beginning of the 20th century thanks to the new synthesis methods in Organic Chemistry. These synthetic pigments are now a very important group in the manufacture of colours for artists, producing bright and luminous tones with extraordinary intensity and excellent stability and permanence. The range of organic pigments is currently very extensive and includes azo pigments, blues, phthalocyanine greens, dioxazines, pyrroles, anthraquinones, quinacridones, etc.
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