Nigrosine, also known as Acid Black, is a mixture of synthetic black dyes used in histology and textile dyeing. Its structure contains aromatic rings and sulfonate groups, typically present as a sodium salt, giving it acidic dye properties.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Amido black 10B
textile and leather dye
Acid Green 20
Acid dye for textiles
Direct green 1
Direct dye for cellulose fibers
Direct Yellow 44
Direct dye for textiles
H2TPTBP
Dye and pigment intermediate
1,5-naphthalenedisulfonic acid
Dye intermediate
4,4′-diamino-2,2′-stilbenedisulfonic acid
Chemical intermediate for dyes and fluorescent brighteners
Reactive Black 5
reactive dye for textile
The international HS code for 4-Amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt (CAS 8005-03-6) is 3204.12.
3204.12
3204 12 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
disodium;4-amino-5-hydroxy-3-[(4-nitrophenyl)diazenyl]-6-phenyldiazenylnaphthalene-2,7-disulfonate
AOMZHDJXSYHPKS-UHFFFAOYSA-L
C1=CC=C(C=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC4=CC=C(C=C4)[N+](=O)[O-])N)O.[Na+].[Na+]
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