3215.11.90.50 - Offset Lithographic

This HTS code, 3215.11.90.50, specifically classifies black printing ink intended for use in offset lithographic printing processes. Offset lithography is a widely used commercial printing technique that relies on the principle of oil and water repulsion. The ink must therefore possess specific rheological and chemical properties to be suitable for transfer from a plate to a blanket cylinder and then to the printing substrate.

This category is distinct from its siblings by its explicit focus on offset lithographic inks. For instance, 3215.11.90.20 covers flexographic inks, which are typically less viscous and designed for printing on flexible packaging materials using raised-image plates. Similarly, gravure inks (3215.11.90.30) are formulated for intaglio printing, where ink is held in recessed cells, and letterpress inks (3215.11.90.40) are used for relief printing. The "Other" categories at this level (3215.11.90.60) would capture black printing inks for offset lithography that do not fit into more specific sub-classifications, although 3215.11.90.50 itself is quite specific.

As this is a leaf node within the HTS, there are no further subcategories. The classification is granular enough to distinguish offset lithographic black printing inks from other types based on the printing technology employed and the ink's intended application within that process. This ensures accurate tariff application for this specific type of printing ink.