Indanthrone blue

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, alkyd, 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]

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)
Properties
C28H14N2O4
Molar mass 442.430 g·mol−1
Appearance dark blue solid
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

It was the first example of the brand "Indanthren" (an acronym for Indigo from anthracene) introduced by BASF in 1901.[3][4][5] One coincidental result is that even now, in Japan vat dyes are commonly described as thren(e) dyes (スレン染料), derived from the Japanese transliteration of the brand.[6][7]

Properties

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
  1. Summary of Color Additives for Use in the United States in Foods, Drugs, Cosmetics, and Medical Devices, Food and Drug Administration
  2. Current EU approved additives and their E Numbers, Food Standards Agency
  3. Entry on Indanthron-Pigmente. at: Römpp Online. Georg Thieme Verlag, retrieved 16. Januar 2013.
  4. "Marken - Registerauskunft - Indanthren". DPMAregister (in German). Retrieved 29 August 2020. Anmeldetag: 05.08.1901 / Inhaber: BASF AG
  5. Zollinger, Heinrich. Color Chemistry: Syntheses, Properties, and Applications of Organic Dyes and Pigments. John Wiley & Sons. p. 255. ISBN 978-3-906390-23-9. Retrieved 29 August 2020. The German word Indanthren is an acronym for Indigo aus Anthrazen
  6. "COLOURFUL WORLD III". www.eonet.ne.jp. Retrieved 29 August 2020. バット染料の主たる製造元は、ドイツの化学会社でありその時の商標が、 “インダンスレン” であったことからスレン染料と呼ぶ場合も多くあります
  7. "アルテモンド　豆知識　/　スレン染料". www.artemondo.co.jp. スレン染料（threne dye）とは、バット染料（vat dye）の俗称
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