Acrylic Paint Natural Sienna 1 L - Fine Arts

Colour: Natural Shadow
Lightfastness: AA
Opacity: Opaque
Pigment: PY42, PR101, PBk7
Pigment Description: Synthetic Iron Oxide, Synthetic Red Iron Oxide, Nearly Pure Amorphous Carbon
ASTM Lightfastness Rating: -
Pigment Classification: Mixture
Colour Index Number: -
Viscosity Range (mPa.s): 15,000 - 20,000

Colour Index
The pigments used are both inorganic and organic. The inorganic pigments have been used since ancient times and most are derived or extracted from minerals and clays, such as natural earths, siennas, and ochres. Titanium pigments, carbon, ultramarine blue, cobalt, and cadmium also belong to this category. Many of these are now synthesised through industrial processes. Organic pigments are more modern, developed in the early 20th century thanks to 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, covering azo pigments, phthalocyanine blues and greens, dioxazines, pyrroles, anthraquinones, quinacridones, and more.
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