Photographic chemicals
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Other: > Other: > Aromatic or modified aromatic: > Other: > Photographic chemicals
Duty Rate (from China)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2933.99.24.00
4-Methyl-1-phenyl-2-pyrazolin-5-one
This aromatic heterocyclic compound with nitrogen hetero-atoms serves as a key photographic chemical used in color film development processes. It functions as a developing agent in the formation of magenta dye images during photographic processing. Classified under HTS 2933.99.24.00 due to its specific use in photography and aromatic heterocyclic structure.
1-Phenyl-3-pyrazolidinone (Phenidone)
Phenidone is a pyrazolidinone derivative used as a superadditive developing agent in black-and-white photographic films and papers. This aromatic nitrogen-heterocycle enhances development speed when combined with other agents. It qualifies for HTS 2933.99.24.00 as a specialized photographic chemical.
3-Methyl-1-p-sulfophenyl-5-pyrazolone
A sulfonic acid derivative of pyrazolone used as a coupler in color photographic development to produce yellow dye images. This aromatic heterocyclic compound with nitrogen hetero-atoms is essential for multilayer color film processing. Its photographic specificity places it under HTS 2933.99.24.00.
2-Amino-5-diethylaminotoluene Hydrochloride
This aromatic amine serves as a color developer in photographic processing, particularly for dye diffusion transfer processes. The hydrochloride salt form maintains stability for industrial use in imaging chemistry. Classified as a photographic chemical under HTS 2933.99.24.00 per Chapter 29 salt classification rules.
N-(2-Cyanoethyl)-N-ethyl-p-toluidine
A cyanoethylated aromatic amine used as a developer in instant color photography systems. This nitrogen-heterocycle derivative participates in dye release mechanisms during image formation. Its specific photographic application qualifies it for HTS 2933.99.24.00.
5-Nitrobenzimidazole
A nitro-substituted benzimidazole used in photographic antifoggants and stabilizers for silver halide emulsions. This aromatic fused heterocyclic system prevents unwanted fog during film development. Classified under HTS 2933.99.24.00 as a photographic chemical per Chapter 29 nitro derivative provisions.
1-(2,4-Diamino-5-methylphenylazo)-2-naphthol-7-sulfonic Acid
A complex azo coupler used in photographic color development for magenta dye formation, featuring aromatic heterocyclic components. This compound participates in chromogenic reactions specific to silver halide photography. Its photographic chemical role justifies HTS 2933.99.24.00 classification.
4-(N-Ethyl-N-2-methanesulfonylaminoethyl)-2-methylphenylenediamine Sesquisulfate Monohydrate
Known as CD-3, this is the primary color developer for modern C-41 color negative processing. The sesquisulfate salt form provides optimal pH stability for high-volume photo labs. As an aromatic heterocyclic photographic chemical, it falls under HTS 2933.99.24.00.
6-Nitrobenzimidazole
Used as a desensitizer and antifoggant in photographic emulsions, particularly for X-ray films requiring high contrast. This nitro-aromatic heterocycle controls silver halide sensitivity. Its specific photographic function qualifies it for HTS 2933.99.24.00.
2,6-Dichloro-p-phenylenediamine
A halogenated aromatic diamine used in photographic developers for controlled oxidation kinetics in color processing. The chlorine substitution pattern provides specific reactivity for dye formation. Classified as photographic chemical under HTS 2933.99.24.00.
1-(3-Sulfopropyl)-3-methylimidazolium Inner Salt
A zwitterionic imidazolium compound used in photographic wetting agents and antistatic coatings for film bases. The heterocyclic nitrogen structure provides surface activity essential for processing. Falls under HTS 2933.99.24.00 as a photographic chemical.
3,3'-Diethyloxadicarbocyanine Iodide
A cyanine dye used as a spectral sensitizer for panchromatic photographic emulsions, extending silver halide sensitivity to red light. This heterocyclic quaternary salt is critical for color-corrected films. Qualified for HTS 2933.99.24.00 as photographic chemical.
4-Amino-N-ethyl-N-(2-methoxyethyl)-2-methylbenzene Sulfonamide Hydrochloride
Used as a developer incorporation releaser (DIR) in color negative films for image enhancement and sharpness. The sulfonamide functionality provides controlled dye release during processing. As a specialized photographic chemical, classified under HTS 2933.99.24.00.
1-Hydroxy-N,N-diethyl-3-oxo-1H-indole-2-propanamide
An indolic coupler derivative used in photographic color development for fine-grain magenta dyes with controlled solubility. The heterocyclic amide structure ensures compatibility with aqueous processing. Classified under HTS 2933.99.24.00 for photographic use.
2-(2',4'-Diamino-5'-methylphenylazo)-5-carbethoxyaniline
A carbethoxy-substituted azo coupler for photographic magenta dye formation with improved keeping properties. The aromatic heterocyclic system participates in chromogenic development reactions. Its specific role in photography qualifies it for HTS 2933.99.24.00.