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  2. Indigo dye - Wikipedia

    en.wikipedia.org/wiki/Indigo_dye

    Indigo dye is a dark blue crystalline powder that sublimes at 390–392 °C (734–738 °F). It is insoluble in water, alcohol, or ether, but soluble in DMSO, chloroform, nitrobenzene, and concentrated sulfuric acid. The chemical formula of indigo is C 16 H 10 N 2 O 2. The molecule absorbs light in the orange part of the spectrum (λ max =613 ...

  3. List of dyes - Wikipedia

    en.wikipedia.org/wiki/List_of_dyes

    FD&C Blue No. 1 Acid blue 9 Food blue 2 42090 triarylethlamine 3844-45-9: Brilliant cresyl blue: Cresyl blue BBS Basic dye 51010 oxazin 81029-05-2: Brilliant green: Malachite green G Zeylonka Basic green 1 42040 triarylmethane 633-03-4: Bromsulfthalein: BSP triarylmethane 71-67-0: Bromocresol green: BCG triarylmethane 76-60-8: Bromocresol ...

  4. Azuline - Wikipedia

    en.wikipedia.org/wiki/Azuline

    As a solid, azuline has a metallic appearance with a copper red colour. It hardly dissolves in water, but does dissolve in alcohol. In alcohol it has a strong blue colour, but still has a red tinge. [7] The dye is colourfast, resisting fading by light. [5] Sulfuric acid solution gives a red solution. Iodine destroys the substance.

  5. Blue pigments - Wikipedia

    en.wikipedia.org/wiki/Blue_pigments

    Blue pigments are natural or synthetic materials, usually made from minerals and insoluble with water, used to make the blue colors in painting and other arts. The raw material of the earliest blue pigment was lapis lazuli from mines in Afghanistan, that was refined into the pigment ultramarine .

  6. Anthraquinone dyes - Wikipedia

    en.wikipedia.org/wiki/Anthraquinone_dyes

    By replacing the bromine substituent with an aliphatic or aromatic amine, vibrant blue dyes are obtained. [8] For example, bromamic acid can be condensed with 3-(2-hydroxyethylsulfonyl)-aniline (7) to form the vibrant blue dye (8) (oxysulfone blue), from which the reactive dye C.I. Reactive Blue 19 is obtained after esterification with sulfuric ...

  7. Tekhelet - Wikipedia

    en.wikipedia.org/wiki/Tekhelet

    The Sippar Dye Text (7th century), as well as the Leyden papyrus X and Papyrus Graecus Holmiensis (3rd century) provide recipes for counterfeit takiltu that includes a mixture of red and blue colours, for an overall purple colour. [24] A pure blue can only be produced from Hexaplex dye through a debromination process.

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  9. Cerulean - Wikipedia

    en.wikipedia.org/wiki/Cerulean

    The word is derived from the Latin word caeruleus (Latin: [kae̯ˈru.le.us]), "dark blue, blue, or blue-green", which in turn probably derives from caerulum, diminutive of caelum, "heaven, sky". [2] "Cerulean blue" is the name of a blue-green pigment consisting of cobalt stannate (Co 2 SnO 4). The pigment was first synthesized in the late ...