3707.90.32.20 - Couplers, for use in color negative photographic paper

This HTS category, 3707.90.32.20, specifically covers couplers designed for integration into color negative photographic paper. These chemical compounds are essential components that react with developing agents and oxidized color couplers to form the dyes that create the image on photographic film and paper. Their primary function is to facilitate the color development process in photographic materials.

This classification distinguishes itself from its siblings by focusing on the discrete coupler substances themselves, rather than unsensitized emulsions or coupler dispersions. While 3707.90.32.10 covers the base emulsion, and 3707.90.32.30 addresses pre-mixed coupler dispersions, this code is for the individual coupler chemicals before they are incorporated into the emulsion or a dispersion form. The "Other" categories at this level (e.g., 3707.90.32.90) would typically encompass photographic preparations not specifically enumerated elsewhere.

As this is a leaf node within the HTS structure, there are no further subcategories. The classification is complete at this level, identifying specific chemical couplers for color negative photographic paper. The key criterion for classification here is the chemical composition and intended use as a reactive component in the color photographic process, distinct from the substrate or pre-dispersed formulations.