Basic Info:

  • Chemical Synonym(s): 2-nitro-n-phenylbenzene-1,4-diamine;2-NITRO-4-AMINODIPHENYLAMINE;2-Nitro-4-amino-N-phenylaniline;HC Red 1;HC RED NO 1;1,4-Benzenediamine, 2-nitro-N1-phenyl-;3-Nitro-4-(phenylamino)aniline;N-Phenyl-2-nitro-1,4-benzenediamine
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  • CAS Number: 2784-89-6
  • Chemical Formula:



Melting point
Boiling point
371.14°C (rough estimate)
Refractive index
1.5290 (estimate)
Storage temp
Keep in dark place,Inert atmosphere,Room temperature
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HC RED 1 is an organic compound used as a food colouring. It is the ammonium salt of 6-hydroxy-5-(2,4-dimethylphenylazo)-2-naphthalene sulfonic acid.

The HC RED 1 is the official name of the chemical, which is also known by its common aliases, which include 'Rose Bengal' and 'Erythrosine'

It is produced by mixing several chemicals like aniline, benzene, and nitrobenzene. HC RED 1 is a red dye with a distinct shade of orange and high light stability.

It is produced from an anthraquinone derivative via the condensation reaction between phenol and naphthol. It has the appearance of a water-soluble powder. It is greenish-brown in its normal state, but it is used as a red colouring agent when dissolved.


HC RED 1 is a naphthalene red pigment red is a red pigment used in paint and printing inks. It is a low-cost, fast-drying and highly coloured red in the industry.

In the granular form of pigment characteristics: the granularity of the grade allowed in the printing is small; in the printing can be comparable with the pearl lustre of the red particles; in the printing can produce false with the yellow, brown and black and other colours, and the printing effect is beautiful. When with the yellow, brown and black and other colours, the printing effect is beautiful and bright and clear and clear and with a long afterglow.

It is a high purity pigment red ideal red. It has a lightfastness level of the highest of the red pigment red, is the majority of the world's paint colour fastness testing standards, more than four times.

The dye is used in textile printing, paper (to prevent yellowing), cosmetics (lipsticks, blushers, nail varnishes) and food colouring. It is also used as a colourant in soft drinks, desserts, fruit juices, candy, yoghurt, and pet food.

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