9902.08.56 - Reactive Black 5 (tetrasodium 4-amino-5-hydroxy-3,6-bis [(4-{[2-(sulfonatooxy)ethyl] sulfonyl} phenyl)diazenyl]-2,7-naphthalenedisulfonate) (CAS No. 17095-24-8) (provided for in subheading 3204.16.50)

This HTS category, 9902.08.56, specifically covers Reactive Black 5, a synthetic organic dye identified by its chemical name and CAS number. As indicated in its description, this substance is provided for under subheading 3204.16.50 of the Harmonized Tariff Schedule, which deals with other synthetic organic coloring matter. The inclusion within Chapter 99 signifies that this classification is subject to temporary legislation, trade agreement modifications, or specific import restrictions, such as those proclaimed under Section 22 of the Agricultural Adjustment Act.

Given that this is a leaf node within the HTS structure, there are no further subcategories to explore. The classification is highly specific to Reactive Black 5 itself. Therefore, distinguishing it from sibling categories (which represent a broad range of live animals in this example) is straightforward: this node pertains to a chemical dye, not live animals. Its position within Section XXII and Chapter 99 highlights its unique regulatory status, separate from the primary product classifications found in earlier chapters of the HTS. Classification within this subheading is based on the specific chemical identity and intended use of Reactive Black 5 as a coloring agent.