Indanthrone blue

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Indanthrone blue
Skeletal formula
Ball-and-stick model
Identifiers
CAS number 81-77-6 YesY
PubChem 6690
ChemSpider 6435 YesY
Beilstein Reference 367131
Jmol-3D images Image 1
Properties
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.

Properties[edit]

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.

References[edit]