Toluidine Blue O Dye Base
Toluidine derivative serving as the core amine component for Toluidine Blue O synthesis, a thiazine dye used in histology. HTS 2921.43.4000 applies as it's a chemically defined toluidine derivative listed in additional U.S. note 3 to section VI.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If completed synthetic dye product
Finished synthetic organic coloring matter excludes from chapter 29 per note (g).
If classified as aniline derivative
Misidentified toluidines may shift to earlier aniline subheadings without quotas.
If for diagnostic lab reagents
Composite lab reagents for analysis classify in 3822 regardless of chapter 29 composition.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Distinguish from finished dye (chapter 32) by providing synthesis stage documentation
• Include end-use statement if for lab vs industrial to guide quota allocation
• Package with stabilizers only if necessary for transport per chapter note (f)
Related Products under HTS 2921.43.40.00
p-Toluidine Hydrochloride
p-Toluidine hydrochloride is the salt of 4-methylaniline, a derivative of toluidine with aromatic amine functionality. It falls under HTS 2921.43.4000 as a toluidine derivative salt described in additional U.S. note 3 to section VI, which covers specific organic compounds subject to quantitative restrictions.
o-Toluidine Sulfate
o-Toluidine sulfate is the sulfuric acid salt of 2-methylaniline, used primarily as an intermediate in dye manufacturing. Classified under HTS 2921.43.4000 as a toluidine derivative salt per additional U.S. note 3 to section VI, ensuring control over these regulated aromatic amines.
p-Toluidine Technical Grade 98%
Technical grade p-toluidine (4-methylaniline) at 98% purity, containing minor impurities but remains chemically defined aromatic monoamine. Falls under HTS 2921.43.4000 per U.S. note 3 to section VI for toluidines used in industrial synthesis of dyes and polymers.
N-Ethyl-o-Toluidine
N-Ethyl-o-toluidine is an N-substituted derivative of o-toluidine, maintaining aromatic monoamine function for use in pesticide and dye synthesis. Classified in HTS 2921.43.4000 as toluidine derivative per U.S. note 3 restrictions on these compounds.
4-Amino-2-Methylphenol (2-Methyl-4-aminophenol)
This toluidine-derived aminophenol combines aromatic amine with phenolic function but classifies primarily as toluidine derivative. HTS 2921.43.4000 per chapter note prioritizing later numerical heading and U.S. note 3 listing.
Toluidine Hydrochloride Stabilized
Toluidine hydrochloride with added stabilizer for safe transport, remaining chemically defined per chapter note (f). Used in analytical chemistry; HTS 2921.43.4000 as note 3 toluidine salt.