Direct Dyes — Colrect Range — Avi Chemicals India
Direct Dyes for Paper, Cotton & Cellulosic Applications — Manufacturer India
Avi Chemicals manufactures direct dyes for the paper industry (tissue, kraft, office paper, specialty papers), cotton dyeing, and cellulosic fabric applications. Direct dyes offer the simplest and most cost-effective dyeing system for cellulosic substrates. Available in liquid and powder form for direct dosing into paper machine wet-end systems or textile dyebaths. Exporting to paper manufacturers in Vietnam, Indonesia, Brazil, and India. Free samples and technical consultation available.
Direct Dyes
Direct Dyes for Paper Industry
Direct Dyes for Cotton and Textile
Direct Black 22 (Direct Black VSF)
Direct Black 155 (Direct Black BF)
Direct Black 80 (Direct Black OB)
Direct Black 19 (Direct Black G)
Direct Brown 44 (Direct Brown 2RGL)
Direct Brown 210 (Direct Brown GTL)
Direct Green 114
Direct Green 96 (Direct Green 2BN)
Direct Blue 201
Direct Blue 200 (Direct Blue ABL)
Direct Blue 218 (Direct Blue 2G)
Direct Blue 151 (Direct Blue FR)
Direct Blue 80 (Direct Blue 2RL)
Direct Blue 199 (Direct Turqoise Blue FBL)
Direct Blue 86 (Direct Turqouise Blue GL)
Direct Blue 71 (Direct Blue GLL)
Direct Blue 15 (Direct Sky Blue)
Direct Voilet 66 (Direct Fast Violet RR)
Direct Violet 9 (Direct Violet MB)
Direct Violet 51 (Direct Helio B)
Direct Violet 35 (Direct Violet BL)
Direct Red 243 (Direct Red BWS)
Direct Red 224 (Direct Red F2G)
Direct Red 111 (Direct Fast Red 2BS)
Direct Red 79 (Direct Supra Red 6B)
Direct Red 254 (Direct Pink RL)
Direct Red 239 (Direct Scarlet 6BS)
Direct Red 227 (Direct Fast Rose FR)
Direct Red 89 (Direct Supra Red FR)
Direct Red 83 (Direct Supra Rubine BL)
Direct Red 31 (Direct Red 12B)
Direct Red 81 (Direct Fast Red 5BL)
Direct Red 80 (Direct Supra Red 3BL)
Direct Red 23 (Direct Fast Scarlet 4BS)
Direct Orange 26 (Direct Fast Orange S)
Direct Orange 39 (Direct Supra Orange 2GL)
Direct Yellow 106 (Direct Yellow ARL)
Direct Yellow 86 (Direct Supra Yellow RL)
Direct Yellow 99 (Direct Sun Yellow RCH)
Direct Yellow 142 (Direct Supra Yellow PG)
Direct Yellow 44L (Direct Fast Yellow 5GLL)
Trichomy
Light Shades
Medium Shades
Deep Shades
Avi Chemicals manufactures and exports direct dyes for the paper industry, cotton and cellulosic fabric dyeing, and specialty cellulose-based industrial applications. Direct dyes are the simplest and most cost-effective dye class for cellulosic substrates — they dye cotton and paper directly from an aqueous bath without the need for a reactive chemical or mordant to fix the colour.
The paper industry is the largest global consumer of direct dyes, using them to colour tissue paper, kraft packaging, office paper, specialty papers, and cardboard. Direct dyes are uniquely compatible with the aqueous paper-making process — they dissolve readily in water and distribute evenly through the paper sheet during the wet-end stage of paper manufacturing, producing consistent, uniform colour with minimal process complexity.
For textile applications, direct dyes offer a cost-efficient dyeing solution for cotton, viscose, and blended fabrics where moderate wash fastness is acceptable — such as furnishing fabrics, canvas, and industrial textiles. Available in both powder and liquid form for direct dosing compatibility with paper machine wet-end systems.
Specs grid values for Direct Dyes:
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Application method: Aqueous bath (neutral to slightly alkaline)
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Substrates: Cotton, Viscose, Paper, Cardboard, Tissue
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Wash fastness: 2–4
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Light fastness: 3–5
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Temperature range: 60–90°C (textile); ambient (paper wet-end)
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Best for: Paper dyeing, cost-efficient cotton dyeing, industrial cellulosics
Direct dyes are the dominant dye class for paper colouration globally, accounting for the majority of all dye consumed by paper manufacturers worldwide. Their compatibility with the aqueous, alkaline-to-neutral pH environment of modern paper machines — combined with their simple dissolution, excellent distribution through paper pulp, and availability in both powder and liquid concentrate form — makes them the practical and economical choice for paper manufacturers of all sizes.
Avi Chemicals supplies direct dyes specifically formulated for paper applications to paper mills producing: tissue and facial paper (soft pastel shades), kraft and packaging paper (greens, browns, blacks), coloured office and copy paper (full shade range), specialty coated and uncoated papers, and recycled fibre-based products. Our paper direct dyes offer consistent lot-to-lot colour strength, good retention in the paper sheet (minimising dye loss to white water), and compatibility with standard paper machine retention chemistry including alum, PAC, and cationic starch.
For textile applications, direct dyes provide the most economical route to dyeing cotton, viscose, and cellulosic blended fabrics. Application requires only water, direct dye, and common salt (sodium chloride or sodium sulphate) as an exhausting agent — no reactive alkali, no complex fixation chemistry. This simplicity makes direct dyes suitable for applications where process cost is more important than maximum wash fastness, including: furnishing and upholstery fabrics, canvas and tarpaulin, industrial cellulosic textiles, and novelty fashion fabrics for non-washable applications.
Wash fastness is moderate (Rating 2–4 depending on dye and depth of shade) and can be improved through the use of cationic aftertreatment agents that form an insoluble complex on the fibre surface. Post-treated direct dyes can achieve wash fastness ratings of 3–4, approaching the performance of reactive dyes for less demanding wash requirements at significantly lower cost.
Frequently asked questions
Q1: What are direct dyes used for?
A: Direct dyes are primarily used for two applications: dyeing paper (the largest application globally) and dyeing cotton and cellulosic textiles. In the paper industry, direct dyes colour tissue, kraft, office paper, specialty papers, and cardboard — they are uniquely suited to the aqueous paper-making environment. In textiles, direct dyes are used for cotton, viscose, and cellulosic blended fabrics where cost efficiency is more important than maximum wash fastness — applications include furnishing fabrics, canvas, and industrial textiles. Direct dyes are not suitable for wool, silk, nylon, or polyester.
Q2: What is the difference between direct dyes and reactive dyes for cotton dyeing?
A: Both direct and reactive dyes colour cotton and cellulosic fibres, but they differ significantly in their bonding mechanism and performance. Reactive dyes form a covalent (chemical) bond with cellulose — the dye becomes part of the fibre — producing wash fastness of Rating 4–5. Direct dyes bond through weaker hydrogen bonding and Van der Waals forces, producing wash fastness of Rating 2–4 without aftertreatment. The trade-off: direct dyes are simpler to apply (no alkali required), less expensive, and have no fixation chemistry complexity. Reactive dyes cost more and require careful alkali management but deliver superior durability. The choice depends on your wash performance requirement and total cost of dyeing calculation.
Q3: How are direct dyes applied in paper manufacturing?
A: In paper manufacturing, direct dyes are applied at the wet-end of the paper machine — added to the paper stock (pulp slurry) in the headbox or mixing chest before the sheet is formed. The dye distributes evenly through the fibre suspension and adsorbs onto the cellulose fibres as the sheet forms and water drains. Most direct dyes for paper are supplied in liquid concentrate form for accurate dosing via metering pumps directly into the pulp flow. Key process variables include: stock consistency, pH (ideally 6.5–7.5 for most paper grades), temperature of stock water, and the retention chemistry system used. Avi Chemicals' paper direct dyes are available in liquid form sized for direct pump dosing.
Q4: Can direct dyes be made more wash fast?
A: Yes. Wash fastness of direct dyes on cotton can be improved by post-dyeing treatment with cationic fixing agents. These cationic compounds react with the anionic direct dye on the fibre surface to form an insoluble complex that is significantly more resistant to washing. A good cationic aftertreatment can improve wash fastness by 1–2 rating points — from Rating 2–3 to Rating 3–4 — at modest additional cost. This makes aftertreated direct dyes a cost-effective option for furnishing fabrics, canvas, and other applications with moderate wash performance requirements. Note: cationic aftertreatment may slightly affect shade and can reduce light fastness on some dyes — testing before production is recommended.
Q5: What types of paper can be dyed with direct dyes?
A: Direct dyes are suitable for colouring virtually all paper types made from cellulosic fibres. The main applications include: tissue and facial paper (pastel shades — pink, blue, green, yellow, lavender), kraft packaging paper and board (brown, black, green, red), coloured office and copy paper (full shade range), newsprint with coloured sections, specialty papers including coffee filter paper, food-grade wrapping paper, and industrial packaging. Direct dyes are not suitable for papers coated with non-cellulosic materials or for synthetic paper (polypropylene or polyester-based substrates) where dye affinity is absent.
Q6: What is the minimum order quantity for direct dyes from Avi Chemicals?
A: Standard minimum order quantity for direct dyes is 25 kg per shade for export orders. For paper industry customers requiring liquid form, minimum order quantities and container sizes are discussed based on your specific dosing system and annual consumption. For new customers evaluating our direct dye range for paper or textile applications, we offer free samples (500g–1kg) for laboratory and machine trials. Contact our exports team at info@avichemicals.com or WhatsApp us to discuss your requirement.
Q7: Are direct dyes suitable for use in food-contact or food-packaging paper?
A: Some direct dyes are approved for use in food-contact paper applications, but this is highly regulated and varies by geography. In the European Union, food-contact paper is governed by EU Regulation 10/2011 and specific country regulations. In the United States, FDA regulations govern dyes used in food-contact paper. Not all direct dyes are approved for food-contact use. If you require direct dyes for food-packaging or food-contact paper applications, please contact Avi Chemicals with your specific regulatory requirements — we can advise on which dyes in our range have appropriate approvals and can provide the necessary regulatory documentation.
Q8: What are the advantages of direct dyes over vat dyes for cotton dyeing?
A: Direct dyes offer several practical advantages over vat dyes for standard cotton dyeing: they are significantly simpler to apply (no reduction-oxidation chemistry required), considerably less expensive, and available in a wider range of shades including bright yellows and oranges that vat dyes cannot achieve economically. The trade-off is wash fastness — vat dyes produce wash fastness of Rating 4–5 versus Rating 2–4 for direct dyes. Vat dyes are preferred for workwear, denim, and industrial textiles requiring maximum durability. Direct dyes are preferred for cost-sensitive applications, paper dyeing, and any substrate where process simplicity outweighs maximum fastness requirements.