Hexacyanine 2

Hexacyanine 2 is a synthetic, organic compound classified as an azo dye. It is also known as Acid Blue 9 and has a CAS number of 36536-22-8. It is a cationic dye and is used as a colorant in a variety of industries. It is used in food, pharmaceuticals, cosmetics, plastics, and textiles. Hexacyanine 2 is a dark blue powder that is highly soluble in water and is stable in light, heat, and alkaline conditions.


Chemical Name:

Hexacyanine 2



Molecular Fomula:


Formula Weight:


Chemical Uses


Hexacyanine 2, also known as Acid Blue 9, is a synthetic, organic compound classified as an azo dye. With a CAS number of 36536-22-8, it is a cationic dye used as a colorant in various industries, such as food, pharmaceuticals, cosmetics, plastics, and textiles.

Chemical Properties:



In food, Hexacyanine 2 is used to color beverages, jams, jellies, sauces, and syrups. It is also used as a colorant in various dairy and baked goods, including yogurt, ice cream, cake, and donuts. Additionally, it is used in various packaged and processed foods, such as canned vegetables, sauces, and condiments. 

Hexacyanine 2 is used in the pharmaceutical industry to color medicines, ointments, and other products. It is also used in cosmetics, such as lipsticks and nail polishes, to provide a vibrant shade of blue. 

Hexacyanine 2 is also widely used in the plastics and textile industries. It is added to plastics to provide a range of blue shades, from light to dark. Additionally, it is used to dye various fabrics, from denim to silk.

Chemical Properties

Chemical name:

Hexacyanine 2

Cas No:


Molecular Formula:


Formula Weight:

510.45 g/mol



Melting point

264 °C (dec.)(lit.)


1.2991 (estimate)


Soluble in methanol, dimethyl sulfoxide; partially soluble in water




Blue green

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Tags: HIDC; Hidci; NK-529; Pk 643; DIIC1(5); HIDC IODIDE; Hexacyanine 2;3,3-trimethyl-nyl]-iodide; HEXAMETHYLINDODICARBOCYANINE IODIDE; 1,1′,3,3,3′,3′-hexamethylindocarbocyanine iodide; hexacyanoferrate(iii); hexan-2-amine; hexadecyldimethylamine; hexan-2-one; 2-hexadecanol; hexacyanoferrate(ii)

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