Toluidine Blue O
Toluidine Blue O (C15H16ClN3S) is a thiazine dye derived from toluidine, but as a chemically defined compound primarily used as biological stain, classified under HTS 2921.43.90.90. Not excluded as retail coloring matter.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If acid synthetic dye for textile/retail
Synthetic coloring matter excludes Chapter 29 pure compounds.
If containing sulfur directly linked to carbon
Organo-sulfur compounds in 2930/2934 if meeting specific linkage criteria.
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Import Tips & Compliance
• Include CAS 92-31-9 and dye index CI 52040; prove not 'put up for retail sale' per Chapter Note 2(g)
• Lab chemical imports require end-user certificates to prevent diversion to textile use
• Verify no metal coordination that shifts to later Chapter 29 coordination compounds
Related Products under HTS 2921.43.90.90
p-Toluidine
p-Toluidine is an aromatic monoamine derivative with the chemical formula C7H9N, specifically 4-methylaniline, classified under HTS 2921.43.90.90 as a toluidine derivative. It is a key intermediate used in the production of dyes, pigments, and pharmaceuticals.
o-Toluidine Hydrochloride Salt
o-Toluidine hydrochloride is the salt form of 2-methylaniline (C7H9N·HCl), classified as a toluidine derivative salt under HTS 2921.43.90.90 per Chapter Note 1(C)(1). Used in synthesis of rubber antioxidants and azo dyes.
4-Amino-2-methylbenzoic Acid
This toluidine derivative features both amine-function and carboxylic acid group on a toluene base, classified under HTS 2921.43.90.90 as 'other' toluidines. Used as intermediate for pharmaceuticals and agrochemicals.
N-Ethyl-o-Toluidine
N-Ethyl-o-toluidine (C9H13N) is an N-substituted derivative of o-toluidine, remaining classified as toluidine derivative under HTS 2921.43.90.90. Primarily used in dye manufacturing and as a corrosion inhibitor.
2,5-Xylidine (2,5-Dimethylaniline)
2,5-Xylidine is a dimethyl-substituted toluidine analog (C8H11N), classified as 'other' toluidine derivative under HTS 2921.43.90.90. Essential for producing direct dyes and UV stabilizers.
N,N-Dimethyl-p-Toluidine
N,N-Dimethyl-p-toluidine (C9H13N) is a tertiary amine derivative of p-toluidine, classified under HTS 2921.43.90.90 as other toluidine derivative. Widely used as catalyst in polymerization and dental materials.