Congo Red Direct Red 83 Analytical Grade from Mexico
Congo Red (Direct Red 83) analytical grade is high-purity dye used as pH indicator (red at pH 3-5, blue above 5) and amyloid stain in microscopy. Despite lab use, classified as the synthetic organic coloring matter under HTS 3204.14.25.00. Supplied at 85% dye content minimum.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include intended use declaration; lab dyes still classify by chemistry, not end-use
• Restricted under Toxic Substances Control Act; pre-notice may apply for first import
• Batch certificates must specify CI 22120 to avoid generic 3204.19 classification