2922.29.26.00 - Fast color bases

This HTS subcategory, 2922.29.26.00, specifically encompasses "Fast color bases." These are a group of organic chemical compounds, primarily amino-phenols and amino-naphthols, which are critical intermediates in the production of azo dyes. Their defining characteristic is their ability to react with diazonium salts to form insoluble azo dyes directly on textile fibers or other substrates, thus achieving "fast" coloration that resists washing and light.

Distinguishing this category from its siblings is important for accurate classification. Unlike "Drugs" (2922.29.27.00), fast color bases are not intended for medicinal use but rather as chemical raw materials for coloration. Similarly, they are distinct from "Photographic chemicals" (2922.29.29.00), which are used in photographic processes. The "Other" designation at this level signifies materials that do not fit into the more specific sibling categories but still fall under the broader scope of amino-naphthols and amino-phenols intended for dye synthesis.

As a leaf node, there are no further subcategories under 2922.29.26.00. Classification within this specific code relies on confirming that the chemical indeed functions as a fast color base and is not specifically designated as a drug or a photographic chemical. The key criterion is its chemical structure and its direct application in the synthesis of fast dyes through a coupling reaction.