Indanthrone blue

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Indanthrone blue
Skeletal formula
Ball-and-stick model
CAS number 81-77-6 YesY
PubChem 6690
ChemSpider 6435 YesY
Beilstein Reference 367131
Jmol-3D images Image 1
Molecular formula C28H14N2O4
Molar mass 442.42 g mol−1
Density 1.6 g/ml
Solubility in water Insoluble
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Indanthrone blue, also called indanthrene, is an organic dye made from 2-aminoanthraquinone treated with potassium hydroxide in the presence of a potassium salt. It is a pigment that can be used in the following mediums: acrylic, alkalyd, casein, encaustic, fresco, gouache, linseed oil, tempera, pastel, and watercolor painting. It is used to dye unmordanted cotton and as a pigment in quality paints and enamels. As a food dye, it has E number E130, but it is not approved for use in either the United States or the European Union.[1] [2] Indanthrene Blue RS was patented in 1901 by Rene Bohn as the first anthraquinone vat dye, one of the dyes with very good fastness to light and washing.


It has the appearance of blue needles with metallic luster and melting point of 470-500 °C. It has excellent light fastness, but may bleed in some organic solvents.