3802.90.10.00 - Bone black

This HTS category, 3802.90.10.00, specifically covers "Bone black," also known as animal black. Bone black is a decolorizing and purifying agent produced by charring animal bones. Its porous structure makes it highly effective for adsorbing impurities from liquids and gases, finding applications in sugar refining, water purification, and as a pigment in inks and paints.

Within the broader heading 3802, which encompasses activated carbon and other activated mineral products, this subcategory distinguishes itself by focusing solely on animal-derived blacking agents. It is differentiated from its siblings, "Activated clays and activated earths" (3802.90.20.00) and "Other" (3802.90.50.00). Activated clays and earths are derived from mineral sources and possess different adsorbent properties. The "Other" category serves as a residual for any activated products not specifically enumerated elsewhere.

As this is a leaf node, there are no further subdivisions. Classification at this level relies on the specific identification of the product as bone black, characterized by its origin from animal bones and its inherent decolorizing and adsorbent properties, distinguishing it from mineral-based activated materials.