Toluidine Blue O Dye Base from Japan
Toluidine derivative serving as the core amine component for Toluidine Blue O synthesis, a thiazine dye used in histology. HTS 2921.43.4000 applies as it's a chemically defined toluidine derivative listed in additional U.S. note 3 to section VI.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Distinguish from finished dye (chapter 32) by providing synthesis stage documentation
• Include end-use statement if for lab vs industrial to guide quota allocation
• Package with stabilizers only if necessary for transport per chapter note (f)