Indanthrone blue

Indanthrone blue, also called indanthrene, is an organic dye[1][2] 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.[3][4] The pigment has a color index name of PB60.[5] 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.

Indanthrone blue
Names
Other names
C.I. vat blue 4, carbon paper blue, blue O, carbanthrene blue 2R, fenan blue RSN, graphtol blue RL, medium blue, monolite fast blue 3R, indanthrene, indanthrone, pigment blue 60, C.I. 69800
Identifiers
3D model (JSmol)
367131
ChemSpider
ECHA InfoCard 100.001.251
E number E130 (colours)
UNII
Properties
C28H14N2O4
Molar mass 442.430 g·mol−1
Density 1.6 g/ml
Insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Properties

It has the appearance of blue needles with metallic luster and melting point of 470–500 °C (878–932 °F). It has excellent lightfastness, but may bleed in some organic solvents.

References
  1. Bien, H.-S.; Stawitz, J.; Wunderlich, K. "Anthraquinone Dyes and Intermediates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a02_355.
  2. Bigelow, L. A.; Reynolds, H. H. (1926). "Quinizarin". Org. Synth. 6: 78. doi:10.15227/orgsyn.006.0078.
  3. Summary of Color Additives for Use in the United States in Foods, Drugs, Cosmetics, and Medical Devices, Food and Drug Administration
  4. Current EU approved additives and their E Numbers, Food Standards Agency
  5. MacEvoy, Bruce. "handprint : colormaking attributes". www.handprint.com. Retrieved 17 August 2018.
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