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Indanthrone blue

Compounds
Indanthrone blue, also called indanthrene, is an organic compound with the formula (C₁₄H₆O₂NH)₂. It is a dark blue solid that is a common dye as well as a precursor to other dyes. Wikipedia
Formula: C28H14N2O4
Molar mass: 442.422 g/mol
Solubility in water: Insoluble
Density: 1.6 g/ml
Melting point: 470-500 °C (decomposes)