Toluidine Blue O from Japan

Toluidine Blue O (C15H16ClN3S) is a thiazine dye derived from toluidine, but as a chemically defined compound primarily used as biological stain, classified under HTS 2921.43.90.90. Not excluded as retail coloring matter.

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

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Import Tips

• Include CAS 92-31-9 and dye index CI 52040; prove not 'put up for retail sale' per Chapter Note 2(g)

• Lab chemical imports require end-user certificates to prevent diversion to textile use

• Verify no metal coordination that shifts to later Chapter 29 coordination compounds