3204.13.45.00 - 3,7-Bis(dimethylamino) phenazathionium chloride (Methylene blue); and Basic blue 147

This HTS category, 3204.13.45.00, specifically covers two distinct basic dyes: 3,7-Bis(dimethylamino) phenazathionium chloride, more commonly known as Methylene blue, and Basic blue 147. Methylene blue is a synthetic organic compound widely recognized for its intense blue color and its applications in dyeing textiles, as a biological stain, and even in some medical contexts. Basic blue 147 is another synthetic basic dye, used primarily for coloring various materials. Both fall under the broader classification of basic dyes due to their cationic nature and affinity for anionic substrates.

This classification is distinct from its sibling categories which enumerate other specific basic dyes and broader groups of basic dyes. For instance, 3204.13.10.00, 3204.13.20.00, and 3204.13.25.00 list a variety of other basic dyes by their common names or collective group designations. This particular subcategory, 3204.13.45.00, serves to isolate and precisely classify Methylene blue and Basic blue 147, ensuring accurate duty assessment and statistical tracking for these specific colorants.

As a leaf node in the HTS database, 3204.13.45.00 does not have further subdivisions. Therefore, the classification of goods within this code relies solely on their identification as either Methylene blue or Basic blue 147. Importers must ensure that the imported product precisely matches the chemical identity and common nomenclature of these two dyes to be correctly classified under this heading.