Congo Red Direct Dye
Congo Red (Direct Red 28) is the classic diazo direct dye used for cotton dyeing and as a pH indicator in labs. It qualifies under HTS 3204.14.50.00 as synthetic organic direct coloring matter per chapter note 3. Famous for its red-to-blue color change in acidic conditions.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If acid dye variant for wool
Acid versions of diazo dyes classify under 3204.12 when mordanting required.
If diagnostic reagent grade
Laboratory reagents may classify under 3822 as diagnostic preparations.
If reactive functionality present
Modern reactive red dyes sharing diazo structure classify under 3204.17.
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Import Tips & Compliance
• Include historical C.I. number (22120) and application method in commercial invoice
• Note potential carcinogen classification requiring special handling documentation
• Prevent reclassification as pigment preparation (3206) by proving water-soluble dye form
Related Products under HTS 3204.14.50.00
Direct Black 19 Dye
Direct Black 19 is a synthetic organic azo dye used for direct dyeing of cotton, wool, and silk fabrics without mordants. It falls under HTS 3204.14.50.00 as a direct dye and preparation based on synthetic organic coloring matter, specified in note 3 to Chapter 32. This water-soluble dye produces deep black shades and is commonly used in textile printing.
Direct Yellow 12 Dye
Direct Yellow 12 provides bright yellow shades on cotton and viscose fabrics with good light fastness. This stilbene-based direct dye falls under HTS 3204.14.50.00 as other synthetic organic direct dyes. Commonly used in discharge printing and paper manufacturing.
Direct Brown MX Dye
Direct Brown MX is a multi-azo direct dye producing chocolate brown shades with excellent wash fastness on cellulosics. Classified under HTS 3204.14.50.00 per chapter note 3 for synthetic direct coloring matter. Used in denim dyeing and leather finishing.
Chlorazol Black EX Dye
Chlorazol Black EX (Direct Black 38) is a disazo direct dye renowned for level dyeing and black shade depth on cotton. Falls under HTS 3204.14.50.00 as other direct synthetic dyes per note 3. Still used in critical textile applications despite modern alternatives.
Direct Red 80 Dye Granules
Direct Red 80 produces scarlet red shades with good light fastness on cotton and rayon. This granular direct dye under HTS 3204.14.50.00 facilitates dust-free handling in industrial dyeing. Used in inks, paper, and leather coloration.
Sirius Light Fast Dyes
Sirius Light Fast series represents advanced direct dyes with metal complex structure for superior fastness. Classified HTS 3204.14.50.00 as other direct dyes meeting note 3 criteria. Used where durability exceeds standard direct dyes.