Safety Reference
Danger
H317May cause an allergic skin reaction
H318Causes serious eye damage
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Reactive blue 21
reactive dye for textile coloring
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This compound is a reactive dye used primarily for coloring textiles. It contains an azo chromophore and sulfonate groups that enable covalent bonding with cellulose fibers, providing wash-fast colors.
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 2-Naphthalenesulfonic acid, 7-(acetylamino)-4-hydroxy-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-, sodium salt (CAS 71902-15-3) is 3204.16.
3204.16
3204 16 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-acetamido-4-hydroxy-3-[[4-(2-sulfonatooxyethylsulfonyl)phenyl]diazenyl]naphthalene-2-sulfonate
GQYBFALQKPKBPK-UHFFFAOYSA-L
CC(=O)NC1=CC2=CC(=C(C(=C2C=C1)O)N=NC3=CC=C(C=C3)S(=O)(=O)CCOS(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]