Fast Red Base B
Fast Red Base B is an aniline-derived aromatic monoamine salt specifically formulated as a fast color base for azoic dyeing processes. It couples with naphthol AS to produce brilliant, lightfast red shades on cotton and viscose fabrics. Classified under HTS 2921.42.55.00 as a derivative of aniline used primarily in dye manufacturing for its amine-function chemistry.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If dispersed in aqueous media for direct application as synthetic dye
Chapter 29 excludes synthetic organic coloring matter; finished dyes for textile use shift to Chapter 32 even if chemically an aniline derivative.
If when imported as prepared dye intermediate mixture with stabilizers
Complex chemical preparations not qualifying as pure organic compounds fall under Chapter 38 as chemical products.
If classified as basic aniline salt rather than specialized fast color base
Simpler aniline salts without fast dyeing specificity use earlier subheading; Chapter 29 prioritizes last numerical order for multi-heading compounds.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) confirming it's a fast color base per Chapter 29 notes, not a finished dye (excluded under note 2(g))
• Include Safety Data Sheet (SDS) detailing amine-function composition to avoid misclassification as mixtures or Chapter 32 coloring matter
• Label shipments clearly as 'Fast Color Bases - For Dye Manufacturing Use Only' to prevent retail packing confusion with heading 3212
Related Products under HTS 2921.42.55.00
Fast Blue Base BN
Fast Blue Base BN is a diazotizable aniline derivative salt serving as a fast color base for naphthol coupling in ice dye processes. It produces navy blue shades with excellent wash and light fastness on cellulosic fibers. Falls under HTS 2921.42.55.00 due to its aromatic amine-function structure optimized for stable azoic color development.
Fast Yellow Base GC
Fast Yellow Base GC, an aniline-based fast color base, diazotizes rapidly for coupling with naphthol AS to yield bright, fast yellow-orange shades on textiles. Its salt form ensures stability during transport and processing. HTS 2921.42.55.00 classification reflects its role as an aromatic monoamine derivative for colorfast azoic dyeing.
Fast Scarlet Base B
Fast Scarlet Base B is a specialized aniline salt fast color base that produces scarlet red hues when coupled with beta-naphthol in azoic dyeing systems. It offers superior alkali and chlorine fastness for workwear fabrics. As a pure aromatic monoamine derivative, it properly falls under HTS 2921.42.55.00.
Fast Black Base N
Fast Black Base N, derived from aromatic monoamines, serves as a diazo component for deep black shades in naphthol dyeing with excellent all-around fastness properties. Primarily used for denim and khaki fabrics. Classifies under HTS 2921.42.55.00 as an aniline derivative fast color base per Chapter 29 amine-function provisions.