Dark Grey

Colour: Dark Grey
Lightfastness: AA
Opacity: Opaque
Pigment: PW6, PY42, PR101
Pigment description: Rutile Titanium Dioxide, Yellow Iron Oxide, Red Iron Oxide.
ASTM Lightfastness classification: I
Pigment classification: Mixture
Colour Index Number: -
Viscosity range (mPa.s): 20,000 - 25,000

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