3215.11 - Black:

This HTS category, 3215.11, specifically encompasses **black printing inks**. These inks are designed for application to various substrates through printing processes, such as offset, gravure, flexographic, or screen printing. The defining characteristic is their black pigmentation. This includes inks where black is the primary or sole colorant, regardless of whether they are supplied in liquid, paste, or concentrated form, ready for use or requiring dilution.

This classification is distinct from its sibling category, 3215.19 (Other printing inks), which covers all printing inks that are not black. Therefore, if a printing ink exhibits any color other than black, or is a multi-color ink where black is not the dominant or sole pigment, it would fall under the "Other" subheading.

Within the scope of black printing inks, further subdivisions exist to refine classification. The provided subcategory, "Solid:", indicates a potential further breakdown for black printing inks that are presented in a solid or pelletized form, as opposed to liquid or paste. Additionally, 3215.11.90 ("Other") serves as a residual category for black printing inks that do not fit into more specific sub-classifications within this main heading, likely addressing variations in formulation, packaging, or specific application types not otherwise detailed.