Technical Guide · Shade Continuity

Why Two Greige Lots Dye Differently: Batch, Lot and Shade Continuity

Two lots of the same quality dye differently because "the same fabric" is really four lots stacked — fibre lot, weaving lot, preparation batch and dye lot — and a change in any one shifts how the cloth takes colour. Identical construction guarantees geometry, not dye uptake. Continuity on a repeat order is managed by tracking all four and matching against an approved standard, not by reordering "the same fabric".

Updated 13 August 2026

Why does the same quality dye differently between lots?

Because dye uptake is set by everything colour meets on its way into the fibre — the cotton's origin and maturity, the size recipe the yarn carried, how evenly preparation removed it, and the dyeing conditions of the day. A reorder holds the construction constant while all four of those can move. The result is familiar to every repeat buyer: the second delivery is honestly "the same quality" and visibly not the same colour. The fix is not tighter adjectives on the order — it is knowing which four lots have to be tracked, and anchoring the repeat to a physical standard.

Which four lots have to be tracked?

The four lots stacked inside every dyed delivery — what each controls, how it shifts shade, and what to record
Lot	What it fixes	How it shifts shade	What to record
Fibre lot	The cotton (or fibre blend) the yarn was spun from — origin, grade, maturity	Immature or different-origin cotton takes dye differently; the base cream of greige varies by crop	The spinner’s yarn lot on the greige documentation
Weaving lot	One continuous production run of greige on a set of looms	Two runs mix size recipes, yarn lots and tensions — the classic cause of roll-to-roll shade steps	The mill’s weaving lot number per roll, verified by header matching
Preparation batch	The desize–scour–bleach batch the greige went through together	Uneven or different preparation changes absorbency — the strongest single lever on final shade	The processor’s batch number linking greige lot to prepared lot
Dye lot	One dyeing of one batch to one recipe on one day	Recipe, machine, liquor ratio and even water quality move the landed shade within tolerance	The dye lot number, the recipe reference, and the approved standard it was matched to

The four are nested, not parallel: a dye lot contains one preparation batch, which contains greige from one or more weaving lots, which carry one or more fibre lots. Shade problems travel up that stack — which is why a colour complaint at delivery so often traces back to greige that was two lots pretending to be one.

What does "same construction" not guarantee?

Buyers assume that reordering the same construction guarantees the same result — that 40×40/130×66 is 40×40/130×66. It is not, for colour: construction fixes the cloth's geometry, and dye uptake is chemistry. Two weaving lots of an identical construction can differ in fibre origin, size recipe and preparation history, and each difference lands on the shade. The construction is necessary — it is what makes the two lots comparable at all — but it is nowhere near sufficient, and an order that specifies construction alone has specified a fabric, not the fabric you approved.

What does shade continuity mean on a repeat order?

Not identity — continuity means landing inside an agreed shade band around an approved physical standard. Colour is matched to the standard your first order approved (and its recorded recipe), assessed under agreed lighting, and accepted within the band your programme can tolerate; "indistinguishable in the garment, under the shop light" is a different band from "indistinguishable side by side on a table", and the order should say which one it is buying. A repeat matched to memory, or to a previous delivery that has since washed and faded, is a repeat matched to nothing.

How do you protect a repeat order before the first order ships?

Continuity is cheapest at the moment the first order is still open — everything below costs minutes then, and is unrecoverable later:

1. Keep the approved standards physically. The approved pre-production sample and a sealed cutting of the shipped bulk — filed, dated and dark-stored, per colour.
2. Record the four lot numbers — fibre/yarn lot, weaving lot, preparation batch, dye lot — against the order while the paperwork still exists.
3. Have the recipe referenced. The dyer's recipe reference against your colour standard, named on the order, so the repeat starts from the recipe rather than from scratch.
4. Agree the shade band in writing — the assessment light, the reference standard, and the tolerance the repeat will be accepted against.
5. Ask the single-lot question: if deliveries will be staged, ask your sourcing partner whether greige from one weaving lot can be secured for the programme — and get the answer, either way, in writing.
6. Anchor the greige itself: ends matching the approved sample exactly, GSM within its ±5 band, width within its ±3 inch band — the same written bands that govern any greige order.

From our sourcing floor

The repeat that was matched to a memory.

A recurring pattern: a repeat enquiry arrives as "same as last time" — same construction, same colour name, sometimes a photograph of a garment that has been through a season of washing. Of the four lot numbers behind the first delivery, none was recorded; the approved standard was never kept, or travelled with a departed colleague. The repeat is then matched to the closest thing that still exists, and the buyer's customer is the first to see the difference.

The repeats that land inside their band all had the same boring feature: a kept standard, recorded lot numbers and a referenced recipe — created in the week of the first order, when they cost nothing. Continuity is not a dyeing skill; it is a filing habit with a dyeing consequence.

What should you record so a repeat is reproducible?

The construction and its bands — count, density, the ±5 GSM and ±3 inch width bands, and the approved sample reference.
The four lot numbers — fibre/yarn, weaving, preparation, dye — as delivered, per colour.
The colour standard — the sealed approved cutting, its date, and the light it is assessed under.
The recipe reference — the dyer's identifier for the recipe that hit the standard.
The headers — ask for cuttings from the shipped lot to be retained as the physical record header matching leaves behind.
The route — which processing sequence the lot took, since a repeat on a different route is a different shade problem.

The inspection that generates half of this record — headers from every roll, matched and kept — is described in how greige fabric is inspected.

Related knowledge

How greige fabric is inspected
Header matching — the procedure that catches a mixed weaving lot before it becomes a shade problem.
What is actually in greige fabric: sizing and preparation
The preparation chemistry that makes absorbency — and therefore shade — track the greige’s history.
Stock-lot greige vs made-to-order weaving
Why a stock lot and shade continuity rarely mix — and when that trade is still worth making.
From greige to finished: how width, weight and length change
The sample-approval procedure this page’s record-keeping is built around.
Low-MOQ fabric sourcing from Pakistan
The confirmed dyeing minimums per colour that shape how repeat colourways are planned.

Frequently asked questions

Why does fabric dye differently between batches?

Because every dyed delivery stacks four lots — fibre lot, weaving lot, preparation batch and dye lot — and a change in any one shifts dye uptake. A reorder holds the construction constant while all four can move, so "the same quality" can honestly arrive a different shade.

What is the difference between a dye lot and a fabric lot?

A fabric (weaving) lot is one continuous greige production run; a dye lot is one dyeing of one prepared batch to one recipe on one day. They nest: a dye lot contains a preparation batch, which contains greige from one or more weaving lots. Shade complaints usually trace up that stack.

How do I get the same colour on a repeat order?

Anchor the repeat to physical evidence created with the first order: a kept approved standard, the four recorded lot numbers, the dyer’s recipe reference, and a written shade band with its assessment light. A repeat matched to memory or a washed garment is matched to nothing.

Does the same construction guarantee the same shade?

No. Construction fixes geometry — count and density — while dye uptake is chemistry: fibre origin, size recipe and preparation history all move the landed shade. Identical constructions from two weaving lots can dye visibly differently; that is why the four lots are tracked, not assumed.

What is a shade band?

The agreed tolerance around an approved colour standard within which a delivery is accepted — assessed against the physical standard, under an agreed light. Continuity means staying inside the band across deliveries, not achieving impossible identity; the order should state the band and the light.

On typical values: the four-lot taxonomy and record list are general guidance; how continuity is secured on a specific programme — including whether greige from a single weaving lot can be held for staged deliveries — is agreed per order, in writing, before production. Physical standards and approved specifications override anything illustrated here. Burhan Enterprises is a sourcing and export partner and coordinates through partner mills and processing units.

Set the repeat up while the first order is still open

Tell us the programme and its colourways. We will put the standards, lot records and shade band on paper with partner mills before the first delivery ships — and send free swatches to start the approval trail.

Send your programme