Safety Reference
Warning
H319Causes serious eye irritation
H351Suspected of causing cancer
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Bismark brown r
Basic dye for textile coloring
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This compound is an acid dye used for coloring textiles and in histology for staining biological tissues. It is characterized by its azo structure and sulfonate groups, which confer water solubility and affinity for fibers and proteins.
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.
The international HS code for 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, disodium salt (CAS 5413-75-2) is 2927.00.
2927.00
2927 00 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;7-hydroxy-8-[(4-phenyldiazenylphenyl)diazenyl]naphthalene-1,3-disulfonate
PEAGNRWWSMMRPZ-UHFFFAOYSA-L
C1=CC=C(C=C1)N=NC2=CC=C(C=C2)N=NC3=C(C=CC4=CC(=CC(=C43)S(=O)(=O)[O-])S(=O)(=O)[O-])O.[Na+].[Na+]