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Pigment Blue 21

Catalog Number DYE-PIG-0294
CAS Number 1324-26-1
Synonyms Indo Blue Reddish B-75
Molecular Weight 545.76
Molecular Formula C28H11Cl3N2O4
CI Number C.I.69835
Color red light blue.
Lightfastness Well
Main Molecular Structure anthraquinones
Oleic Acid Insoluble
Preparation Method (1) in 1-Nitrobenzene in ANTIMONY (V) CHLORIDE or Sulfuryl CHLORIDE chlorinated Anthraquinone Blue (C.I. Vat Blue 4, C.I. 69800); (2) in Sulfuryl chloride and Thionyl chloride or ANTIMONY (V) chloride with too much chlorine chlorinated Anthraquinone Blue (C.I. Vat Blue 4, C.I. 69800); (3) in the presence of Manganese dioxide in sulfuric acid with chlorine chlorinated Blue anthrone Anthraquinone Blue (C.I. Vat Blue 4, C.I. 69800).
Properties In concentrated sulfuric acid to dark yellow brown, dilution for blue. In the basic insurance powder solution for blue; In the acidic insurance powder solution for red light blue.

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