2921.43.90/Toluidine Blue O (Basic Blue 17)/Japan

Toluidine Blue O (Basic Blue 17) from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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