Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
Sourcing SPADNS?
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D&C Red 33
Red azo dye for cosmetics
Sourcing SPADNS?
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SPADNS is a trisodium salt of an azo dye used as a chromogenic indicator in analytical chemistry. It is primarily employed for the spectrophotometric determination of metal ions and fluoride ions in solution.
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 SPADNS (CAS 23647-14-5) 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.
trisodium;4,5-dihydroxy-3-[(4-sulfonatophenyl)diazenyl]naphthalene-2,7-disulfonate
AEHGQXKBQBMQEK-UHFFFAOYSA-K
C1=CC(=CC=C1N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)S(=O)(=O)[O-].[Na+].[Na+].[Na+]