Product
Direct Dyes
Direct Dyes colour cotton, viscose and paper without a mordant, supplied in standard and light-fast ranges as an economical choice for cellulosic fibres.
- Grades / forms
- Standard & light-fast ranges
Overview
Direct dyes are long, flat anionic molecules with a natural affinity for cellulose. They dye cotton, viscose, linen and paper simply from a hot bath with salt, without the alkali fixation that reactive dyes need. That makes the process short, cheap and forgiving.
Their weakness is wet fastness, because the dye is held by physical attraction rather than a chemical bond. A cationic after-fix treatment improves it considerably. Light-fast ranges are used for upholstery, curtains and other end uses exposed to sunlight; liquid direct dyes are widely used in paper mills.
Applications
- 1Cotton and viscose dyeing for economy ranges
- 2Paper and tissue colouring
- 3Linen and jute
- 4Leather dyeing
- 5Upholstery and curtains (light-fast range)
Packing & storage
Packing
- 25 kg fibre drums with PE liner
- 25 kg cartons
- Liquid grades in carboys and IBCs
Storage & handling
Keep sealed in a cool, dry place away from direct sunlight.
Enquire
Get a price for Direct Dyes
Send grade, quantity and destination port. Price, lead time and documents come back within one business day.
Request a quotation or call +91 97979 77958- Certificate of Analysis with every batch
- SDS in destination format
- Made to your specification
- Private label packing
Questions
Direct Dyes, answered.
Treating the dyed fabric with a cationic fixing agent after dyeing locks the anionic direct dye in place and markedly improves wash and wet-rub fastness. Copper after-treatment is used for some light-fast dyes.
Cotton takes on a negative surface charge in water that repels anionic direct dyes. Salt suppresses that charge so the dye can approach and exhaust onto the fibre.
Direct dyes are cheaper and simpler to apply but have lower wash fastness. Reactive dyes form a covalent bond with cotton and give much higher wash fastness, so they are standard for garments that will be laundered often.
Yes. Cosmo Chemistry manufactures and exports Direct Dyes from Surat, Gujarat, India to more than 55 countries, for customers in the industrial & cosmetic dyes industry. Send your grade, quantity and destination port for a quotation within one business day.
Every shipment of Direct Dyes from Cosmo Chemistry includes a batch-specific Certificate of Analysis (COA) and Safety Data Sheet (SDS). Certificate of Origin, third-party pre-shipment inspection and destination-specific regulatory documentation are arranged on request.
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