3707.90.32.10 - Unsensitized emulsions, for use in color negative photographic paper

This classification covers unsensitized emulsions specifically formulated for use in the production of color negative photographic paper. These preparations are not light-sensitive themselves but are essential components that, when coated onto a substrate, will form the light-sensitive layers of photographic paper. They typically contain binders, sensitizing dyes (though the dyes are not the primary classifying feature here), and other chemical additives that facilitate image formation and development.

It is crucial to distinguish this category from its siblings. While 3707.90.32.20 and 3707.90.32.30 cover specific photographic chemicals like couplers and coupler dispersions intended for color negative photographic paper, this category specifically addresses the *emulsion* itself. The emulsion is the broader mixture of light-sensitive silver halide crystals suspended in a gelatin or other binder, which forms the basis of the photographic layer. The other siblings are distinct chemical entities that are either added to or incorporated within such emulsions to achieve specific color reproduction characteristics.

As this is a leaf node within the HTS, there are no further subcategories. Therefore, classification under 3707.90.32.10 is final for unsensitized emulsions intended for color negative photographic paper. The key criterion for inclusion is the specific end-use in the manufacture of this type of photographic paper, as opposed to emulsions for other photographic media or general chemical preparations not specifically designed for this photographic application.