Martius Yellow Base (1-(2,4-Dinitrophenylazo)-2-Naphthol)
While technically an azo compound, pure Martius Yellow base retains naphthol classification under HTS 2907.15.60.00 when imported as chemical intermediate. Used in biological staining and pigment production.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If synthetic organic pigment grade
Pigment-grade azo compounds classified as coloring matter in Chapter 32.
If quaternary ammonium salt form
Heterocyclic compounds with nitrogen take precedence in later 2933 heading.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Spectral analysis to prove naphthol structure dominates over azo function for Chapter 29
• Industrial end-use declaration prevents retail dye repacking issues (3212)
• Monitor for re-export as finished pigment triggering different duty
Related Products under HTS 2907.15.60.00
1-Naphthol
1-Naphthol is a monophenolic compound derived from naphthalene, classified under HTS 2907.15.60.00 as one of the 'other' naphthols and their salts. It is a chemically defined organic compound used primarily as an intermediate in dye synthesis and pharmaceutical production.
2-Naphthol
2-Naphthol, also known as β-naphthol, is a key monophenol in the naphthols category under HTS 2907.15.60.00. This separate chemically defined compound serves as a critical intermediate for azo dyes, antioxidants, and rubber chemicals.
1-Naphthol-3,6-Disulfonic Acid (H Acid precursor salt)
A disulfonic acid salt of 1-naphthol, captured in HTS 2907.15.60.00 'other' category for naphthols and salts. Intermediate for H-acid used in reactive dyes.
Tobias Acid Sodium Salt (2-Naphthylamine-6-Sulfonic Acid precursor)
Sodium salt of naphthol sulfonic acid used in dye chemistry, classified under HTS 2907.15.60.00 'other naphthols.' Key for naphthol AS dye series.
Sodium 1-Naphthol-4-Sulfonate
This is the sodium salt of 1-naphthol-4-sulfonic acid, classified as 'other' naphthols and their salts in HTS 2907.15.60.00 per chapter note 3(C)(1). It functions as a diazo dye coupling component in textile coloration.
2-Naphthol-6,8-Disulfonic Acid Disodium Salt (Schaeffer Salt)
Schaeffer salt is a disulfonated naphthol sodium salt under HTS 2907.15.60.00 as 'other' naphthols and salts. Used in azo dye production for textiles and leather.