Toluidine Blue O Dye Base from Canada
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 — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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)