indigo blue

indigo blue
indigo-blue, adj.
1. indigo (def. 4).
2. Also called indigo, indigotin. a dark-blue, water-insoluble, crystalline powder, C16H10N2O2, having a bronzelike luster, the essential coloring principle of which is contained along with other substances in the dye indigo and which can be produced synthetically.
[1705-15]

* * *


Universalium. 2010.

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  • indigo blue — /ɪndɪgoʊ ˈblu/ (say indigoh blooh) noun 1. the colour indigo. 2. the essential colouring principle (a chemical compound, C16H10N2O2), which is contained, together with other substances, in the dye indigo, and which is now prepared artificially.… …  

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