Historical azurite, from copper carbonate minerals, lacks the stability and durability required for modern painting, this mixture affordably approximates azurite's deep greenish blue. (Series 1) The first acrylic colors offered by GOLDEN, Heavy Body paints are known for their exceptionally smooth, buttery consistency. The Heavy Body palette includes the largest assortment of unique pure pigments in a 100% acrylic emulsion available to professional artists. These colors offer excellent permanency and lightfastness. There are no fillers, extenders, opacifiers, toners, or dyes added. Each Heavy Body color formula reflects the qualities of its pigment. Colors that tolerate a higher pigment load dry to a more opaque, matte finish. Colors that are more reactive and do not allow as much pigment loading tend to have a glossier, more transparent, finish. Because Heavy Body colors contain no matting agents, the gloss of each color will be different. Characteristics:Thick paints that retain texture of brushstrokes and tool marksNo fillers, extenders or dyes Rich, vibrant colors for clean color mixing Technical Detail Opacity / Transparency Semi-Transparent Lightfastness rating Munsell Notation Listing Hue:7 P Value:3 Chroma:3.1 Gloss Average 21.2 Viscosity Range 20000-27000 CPS CIE L*a*b* Values L*31.92 a*-5.25 b*-16.01 Tint Strength 85.69 Pigment Detail PBr7 CI number:77491 Common name:Brown Iron Oxide Classification:Natural Inorganic Chemical Description:Calcined Natural Iron Oxide PW6 CI number:77891 Common name:Titanium White Classification:Synthetic Inorganic Chemical Description:Titanium Dioxide Rutile PB15:0 CI number:74160 Classification: Chemical Description:Copper Phthalocyanine