Toluidine Blue O (Basic Blue 17) from Germany
Toluidine Blue O is a thiazine dye derived from toluidine, used in histology and microbiology staining. While primarily a colorant, its toluidine base and chemical purity qualify it under HTS 2921.43.90 rather than Chapter 32 when imported as pure compound. Pharmaceutical grade requires >85% purity.
Duty Rate — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
Import Tips
• Provide dye index number (C.I. 52040) and absorption spectrum for identity confirmation
• Pharma grade requires USP/NF certificate; technical grade may face 3204 scrutiny
• Declare metachromatic staining end-use to support Chapter 29 classification