C.I. Fast Red Base B
C.I. Fast Red Base B is a sulfonamide-derived diazo component used in the production of azo dyes for textile coloration. It functions as a fast color base that couples with naphthol salts to produce vibrant, lightfast red shades on cotton fabrics. Classified under HTS 2935.90.20.00 as a fast color base within the sulfonamides category per Chapter 29 notes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If pre-coupled with diazonium salt forming synthetic dye
Completed synthetic organic dyes fall under Chapter 32 heading 3204, excluding Chapter 29 intermediates per chapter exclusion note (g).
If containing heterocyclic ring structures beyond simple sulfonamides
Certain nucleotide-type or other heterocyclic intermediates classify under heading 2934 rather than sulfonamides in 2935.
If imported as prepared dye solution for retail or specific use
Mixtures prepared for specific dye applications fall under Chapter 38 per chapter exclusion note (k).
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Import Tips & Compliance
• Verify purity certificates to confirm chemical identity as per Chapter 29 note (a); ensure packaging prevents moisture absorption which affects reactivity; declare as dye intermediate not finished coloring matter to avoid Chapter 32 reclassification
Related Products under HTS 2935.90.20.00
C.I. Fast Blue Base RR
C.I. Fast Blue Base RR is a sulfonamide fast color base used to produce brilliant blue shades in azo dyeing processes for cellulosic fibers. It diazotizes readily and couples efficiently with beta-naphthol for wash-fast colorations. Falls under HTS 2935.90.20.00 as specified fast color salt/base of sulfonamides.
Fast Garnet GBC Base
Fast Garnet GBC Base is an arylsulfonamide diazo component producing scarlet shades when coupled with naphthols in ice dyeing. Widely used for medium-fast pigment colors on cotton and rayon. HTS 2935.90.20.00 classification applies to this sulfonamide fast color base.
C.I. Fast Scarlet Base R
C.I. Fast Scarlet Base R, a p-aminoacetanilide sulfonamide derivative, serves as fast color base for brilliant scarlet dyeings on cotton via naphthol coupling. Offers excellent light and chlorine fastness in ice colors. Specifically covered under HTS 2935.90.20.00 for sulfonamide fast color bases.
Fast Yellow GC Base
Fast Yellow GC Base is a meta-sulfonamide diazo component yielding bright yellow shades with naphthol AS coupling agents. Used in printing pastes for discharge styles. Classifies under HTS 2935.90.20.00 as sulfonamide fast color base.
C.I. Base Red GL
C.I. Base Red GL provides crimson shades through coupling with 2-naphthol-6-sulfonic acid in pigment printing. Sulfonamide structure ensures rapid diazotization. HTS 2935.90.20.00 for fast color salts/bases of sulfonamides.
Fast Bordeaux GP Base
Fast Bordeaux GP Base, an ortho-sulfonamide derivative, couples to give bordeaux shades with superior fastness properties. Used extensively in leather dyeing. Covered by HTS 2935.90.20.00 classification.