Photographic Pyrazole Coupler for RA-4 Paper
Specialized pyrazole coupler optimized for RA-4 color negative paper processing systems, forming magenta dyes with rapid-access chemistry. HTS 2933.19.30.10 applies to this aromatic heterocyclic compound due to its pyrazole ring and specific designation for color negative photographic paper. Ensures high-quality prints with neutral magenta reproduction.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for direct use in color paper manufacturing
Couplers supplied to paper manufacturers may classify as sensitized emulsion components under Chapter 37.
If containing nucleic acid-like nitrogen heterocycles
Different heterocyclic ring systems have separate provisions later in Chapter 29.
If as part of complete photographic developer kit
When packaged with developers as pickling preparations for photo processing, shifts to Chapter 38.
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Import Tips & Compliance
• Reference RA-4 process compatibility in technical specs to justify photographic paper-specific subheading
• Monitor solvent content per chapter note 1(e); transport solvents must not imply specific non-photographic use
Related Products under HTS 2933.19.30.10
4-Amino-3-methyl-1-phenylpyrazol-5-one Coupler
A specific aromatic pyrazolone coupler (CAS 104-26-7 variant) designed for magenta dye formation in color negative photographic paper emulsions. Classified under HTS 2933.19.30.10 due to its unfused pyrazole ring structure and exclusive application in photographic color paper processing. It couples with color developer to produce stable dye images upon silver halide development.
3,3-Dichloro-1-phenylpyrazole Coupler
Halogenated aromatic pyrazole coupler for high-stability magenta imaging in color negative photographic paper, per chapter note on halogenated derivatives. Classified in HTS 2933.19.30.10 for its unfused pyrazole structure and designated photographic paper application. The dichloro substitution enhances light fastness of developed dyes.
Pyrazolone Color Coupler for Photographic Paper
This is a pyrazole-based heterocyclic compound used as a color coupler in color negative photographic paper, reacting with oxidized developer to form magenta dye images during processing. It falls under HTS 2933.19.30.10 as an aromatic pyrazole derivative specifically designated for photographic chemical applications in color negative paper. The chemical structure contains an unfused pyrazole ring essential for its coupling function in silver halide emulsions.
Ballasted Pyrazole Magenta Coupler CP-1
Ballasted aromatic pyrazole coupler (similar to CP-1 analogs) with long-chain alkyl groups for oil-form dispersion in color negative photographic paper. Falls under HTS 2933.19.30.10 as a modified aromatic pyrazole specifically for photographic color paper coupler applications. The ballast prevents dye migration in processed prints.