Colour is a process decision, not a swatch
Most buyer conversations about colour start and end with a Pantone reference. That reference matters, but it answers only one of the questions a factory has to settle before a metre is dyed. At what stage does colour go in? Which dye class? Screen or digital? Each choice changes the hand feel, the wash performance, the price and how quickly you can reorder.
Buyers who understand those choices get better ranges, because they stop asking for things that fight each other. A deep navy that must survive fifty washes, feel buttery soft, carry a photographic print and come in a short trial run is four requirements pulling in different directions. Someone has to choose. This guide explains how the choices work inside a vertically integrated factory, so the someone can be you.
Where colour enters: fibre, yarn, piece and product
Cotton can take colour at four different points in its journey, and the point you pick decides a great deal about the finished article.
- Fibre dyeing colours loose fibre before it is spun. It is the least common route here, used mainly for melange yarns where dyed and undyed fibres are blended to give a heathered, flecked look. Throws and knitted cushions use melange for exactly this reason.
- Yarn dyeing colours yarn on cones or in hanks before weaving. This is how every genuine stripe, check, chambray and gingham is made. Colour runs right through the yarn, so fastness is generally excellent and the pattern cannot wear off, because it is structural. The catch is commitment: once yarn is dyed, it is dyed, and the colour card locks earlier than buyers expect.
- Piece dyeing colours woven cloth in a single shade. It is the workhorse route for solid colour bed linen, plain cushion grounds and curtain fabrics, because one greige quality can be split into many shades late in the process. That flexibility is worth a lot when you are chasing a season.
- Product dyeing colours the finished, stitched item. Used sparingly, mostly for garment washed effects where a lived-in look is the point. Measurement control is harder, since the piece shrinks after it is sewn.
A useful shorthand: woven pattern means yarn dyeing, a solid means piece dyeing, and pattern sitting on the surface means printing.
The dye classes that matter for home textiles
Dye chemistry sounds like a subject for a mill technician, and mostly it is. But three names come up often enough in buyer specifications that they are worth knowing.
Reactive dyes
Reactive dyes form a covalent bond with the cellulose in cotton, so colour becomes part of the fibre rather than a coating on it. That gives bright, clear shades with good wash fastness and a soft hand, which is why reactive dyeing is the default for quality cotton bed linen and most of our printed ranges. The process needs salt, alkali and a thorough wash off, so it uses more water and time than the alternatives.
Pigment
Pigments are not dyes in the strict sense. They are insoluble colour particles fixed to the surface of the cloth with a binder and cured by heat. No wash off step is needed, which makes the route fast, economical and forgiving on blends where a single dye class would not colour both fibres. Pigment handles large flat areas of colour beautifully. Over many washes and with heavy rubbing it fades earlier than reactive, and the binder leaves the cloth marginally firmer.
Vat and disperse
Vat dyes give outstanding light and wash fastness on cotton and are often specified for products that live in daylight, such as heavier curtain fabrics. The shade range is narrower and the cost higher. Disperse dyes are the polyester answer, used for poly cotton items and for sublimation printing, where colour transfers as a gas and becomes part of the synthetic fibre.
Printing methods compared
Once you are printing rather than dyeing, four routes cover almost everything made in India.
- Rotary screen printing. Cylindrical engraved screens, one per colour, rotate over the cloth as it runs through. Fast, with excellent coverage and repeatability, which makes it the standard for volume. Each colour needs its own screen, so setup cost rises with the colour count and falls, per metre, as the run gets longer.
- Flat bed screen printing. The same principle with flat screens lowered onto stationary cloth. Slower, but better for larger repeats, placement prints and panel designs, which is why it earns its keep on table linen and panel style cushion fronts.
- Hand block printing. Carved wooden blocks pressed by hand, colour by colour, along the cloth. It is genuinely handcrafted and the small irregularities are the appeal, not a defect. Expect slight variation between pieces and build that into your quality standard rather than fighting it.
- Digital printing. Inkjet heads print directly onto prepared cloth from a file. No screens, no engraving, no colour count limit, so photographic and complex multi colour artwork is straightforward and a colourway change costs nothing but a file. Print speed is slower and ink cost per metre higher, so the economics favour short and medium runs.
For most retail programmes, develop and trial digitally, then move the designs that sell onto rotary screen once repeat volume makes the screens worth engraving. We run both, and we will say plainly which one your design belongs on.
Why bulk shade never matches the lab dip exactly
Here is the thing nobody tells first time importers. A lab dip is dyed in a beaker sized machine on a small swatch. Bulk runs in a machine holding hundreds of kilos, with a different liquor ratio, different water and a different lot of base fabric. Those differences move the shade, always slightly and sometimes visibly.
The professional answer is not to pretend otherwise. It is to approve a bulk shade band: fabric dyed in the production machine, cut into strips, sent for approval with an agreed tolerance expressed as a grey scale rating. You approve the shade production can actually hold, not the one a laboratory achieved once. Our guide to sampling shows where lab dips, strike-offs and shade bands sit in the development calendar.
Two related points save arguments later. Ask for shade continuity across the order, so cushions cut from different rolls still sit together on a shelf. And agree what happens to the tail end of a dye lot, because that is where drift shows up first.
Fastness: what goes wrong and when
Colour problems arrive in predictable forms, and each has a test behind it:
- Colour bleeding in the wash. Unfixed dye releasing into the water and staining lighter items in the load. Tested as colourfastness to washing. Deep reds, indigos and blacks carry the highest risk.
- Crocking, or rub off. Colour transferring when the fabric is rubbed, dry or wet. Tested with a crockmeter. This is the failure mode that bites pigment prints and very deep shades, and the one customers notice on throws sitting against a light sofa.
- Fading in light. Tested as colourfastness to light. It matters most for anything that hangs in a window, which is why curtain fabrics justify a more expensive dye class.
- Colour change after washing. The shade itself shifting rather than transferring, often linked to the finish rather than the dye.
All of these are measured on a standard grey scale, and the rating you require belongs in the purchase order, not in a conversation after the goods land. Our piece on quality control inside a home textile factory covers where that testing sits in the wider inspection chain.
What each route costs you in money and time
Colour decisions show up on your landed cost in three places. First, process steps: reactive printing needs steaming and washing, pigment does not, and those steps are real money and real hours. Second, setup: rotary screens are engraved per colour and per design, so a nine colour artwork carries a different burden from a three colour one. Third, run length, because any setup cost divides across the metres you print. That is why the same design can be expensive as a trial and sensible as a repeat.
Lead time follows the same logic. Yarn dyed constructions need colour locked earliest, since dyeing has to finish before weaving starts. Piece dyed solids move quicker and are easier to change late. Digital prints turn around fast, which is exactly why they suit newness and testing. We work to low and flexible MOQs, so trialling a design digitally before committing to screens is practical rather than theoretical.
Water, chemistry and the compliance side
Dyeing is the most resource hungry part of textile manufacturing, and it is where a factory's environmental claims are either real or decorative. Ask concrete questions. Is there an effluent treatment plant, and is treated water recovered back into the process? Are the dyes and auxiliaries restricted substance compliant for your market? Can the factory produce test reports rather than assurances?
Certification does part of this work for you. OEKO-TEX Standard 100 attests that the certified article has been tested against a defined list of harmful substances, while GOTS covers the processing chemistry used on certified organic goods. Our certifications guide explains what each one does and does not prove, and the fibre side sits in our overview of recycled and organic fibre options.
What to put on your tech pack
A colour specification that prevents arguments contains all of this:
- The colour reference, plus a physical standard if you have one. A dyed swatch beats a code.
- The colouration route: yarn dyed, piece dyed or printed, and if printed, which method.
- The dye class where it matters, particularly for deep shades and anything going into daylight.
- Fastness requirements with the grey scale rating you expect, test by test.
- Shade tolerance, and whether shade continuity across the order is required.
- The approval chain: lab dip, strike-off for prints, bulk shade band, and who signs each.
- Print repeat size and placement rules, including how pattern should fall on cushion covers and any panel item.
None of this is exotic. It is writing down decisions that will otherwise be made by somebody else, quietly, on a production floor eight thousand kilometres away.
Frequently asked questions
What is the difference between reactive and pigment printing?
Reactive printing uses dyes that form a chemical bond with the cotton fibre itself, so the colour sits inside the fibre. The result is soft to the touch and washes well, but the fabric has to be steamed and washed after printing, which adds process steps and cost. Pigment printing sits the colour on the surface of the cloth, held by a binder, and is cured with heat rather than washed off. It is quicker and cheaper, handles large flat areas of colour well, and suits products that are washed less often. The trade off is a slightly stiffer hand feel and lower rub fastness over time.
Should I choose yarn dyed or piece dyed fabric?
It depends on the design. Yarn dyeing colours the yarn before weaving, so stripes, checks, chambrays and ginghams are built into the cloth structure and the colour runs right through. It gives excellent depth and fastness but needs colour decided early and is less flexible once yarn is dyed. Piece dyeing colours woven cloth in a single shade, which is faster, easier to change late in the process and more economical for solid colour ranges. For solids, piece dyeing is usually the sensible route. For woven pattern, yarn dyeing is the only real answer.
Why does production shade differ from the approved lab dip?
A lab dip is dyed in a small laboratory machine on a small piece of cloth. Bulk production runs in a large machine with different liquor ratios, different water volumes and a different base fabric lot. Small differences in any of those shift the shade slightly. This is why a bulk shade band is important: the factory dyes bulk fabric and sends a strip so the buyer approves the shade actually achievable in production, along with an agreed tolerance. Approving only a lab dip and expecting a perfect match in bulk is the single most common source of shade disputes.
Is digital printing cheaper than screen printing?
Not per metre, in most cases. Digital printing has almost no setup cost because there are no screens to engrave, so short runs, test colourways and photographic or multi colour artwork come out cheaper overall. Rotary screen printing carries a real setup cost per colour but prints far faster once running, so unit cost falls sharply as volume rises. The practical rule is to use digital for newness, trials and small drops, and to move a proven design to rotary screen once the repeat volume justifies the screens.
Closing thought
My grandfather judged a dyer by the selvedge and the tail of the lot, not the sample on the desk. The machinery has changed; the principle has not. Colour is not a decision made once at the top of a development calendar. It is a chain of process choices, each narrowing what the finished product can be, and the buyers who get the best results understand the chain rather than only its last link.
If you are planning a range and are unsure whether a design belongs on a yarn dyed loom, a rotary screen or a digital machine, send us the artwork and the story you want the product to tell. We will tell you honestly what each route costs you, and what it costs the product.