1-(2,4-Diamino-5-methylphenylazo)-2-naphthol-7-sulfonic Acid from China
A complex azo coupler used in photographic color development for magenta dye formation, featuring aromatic heterocyclic components. This compound participates in chromogenic reactions specific to silver halide photography. Its photographic chemical role justifies HTS 2933.99.24.00 classification.
Duty Rate — China → United States
19%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Complex structure requires detailed NMR/structural analysis; declare as sulfonated azo compound; ensure wastewater permits for sulfonic acid disposal