Fabric Colorfastness: Testing Hotel Fabrics Against Fading

A hotel sofa that fades in the first season creates a repair bill, a guest photo and a negative review, all from a property that was bought for five years of service. Fading is rarely a fabric defect discovered after delivery; it is a specification that was never set. Colorfastness is the fabric’s resistance to color change under light, rubbing and washing, and it is measured with standard test methods that produce a grade from 1 to 5. Setting the grade in the PO, and verifying it on the production run, is what separates a fade-resistant program from a fade-prone one.

This guide covers the three colorfastness tests that matter for hotel upholstery, the grade thresholds contract programs should demand, and how to verify the numbers before the fabric is cut.

Colorfastness: three tests, three different failures

Colorfastness is not one property. Lightfastness measures resistance to color change from sunlight and artificial light, and it is the test that predicts window-side fading. Colorfastness to crocking measures whether dye transfers to another surface through rubbing, which predicts dye bleeding onto guest clothing and onto adjacent cushions. Colorfastness to laundering or wet cleaning measures dye loss in water, which predicts streaking after professional cleaning. Each test uses a different method, a different exposure, and a different grading scale, so a fabric can score excellent on one and poor on another. The test methods are standardized by the American Association of Textile Chemists and Colorists, whose published procedures are the reference for most commercial upholstery programs; the full method library is maintained at aatcc.org.

Lightfastness: the test that predicts window-side fading

Lightfastness for upholstery is tested with a xenon-arc lamp that reproduces the full light spectrum, per AATCC Test Method 16. The fabric is exposed in measured increments called AATCC fading units, with 20 and 40 AFU being the common checkpoints for contract textiles, and the color change is then graded on the AATCC Gray Scale for Color Change, where 5 means no perceptible change and 1 means severe change. The commercial threshold for hotel seating is a grade of 4 or higher after 40 AFU, which corresponds to a barely perceptible change under the daylight conditions a guest room actually sees. A grade of 4 means the change is visible only on close comparison; a grade of 3 means a perceptible difference that a guest notices within the first year. The same logic applies to artificial light, which is why the spec should name the light source: xenon-arc results approximate daylight, while fluorescent and LED sources are covered by separate exposure options in the same method family.

Crocking: whether the dye moves onto guests and cushions

Colorfastness to crocking is tested with AATCC Test Method 8, where a white test cloth is rubbed against the fabric under controlled pressure, dry and wet, and the dye transfer is graded on a 1-to-5 scale. The dry test predicts normal contact, including guest clothing against a sofa back; the wet test predicts what happens when moisture is present, which for hotel use means after spills, cleaning and humidity. Contract upholstery programs typically require a dry crocking grade of 4 or higher and a wet grade of 3 or higher, with 4 and 5 meaning no visible transfer. Dark colors and heavily pigmented fabrics are the risk zone: deep navy, charcoal and burgundy shades carry more dye per fiber and fail crocking more often than pale neutrals, so a dark program should request the test report, not assume the shade passes. A fabric that bleeds on the wet test will mark cushions in storage and clothing after light rain or a spilled drink.

Why hotel fabrics need a grade-4 lightfastness floor

Guest rooms are a worse environment for fabric color than most homes. East- and west-facing windows put direct sun on seating for hours, sheers and blackout liners are inconsistent across a property, and the same fabric runs in rooms with completely different sun exposure. A grade-3 fabric may pass inspection in a north-facing sample room and fail visibly in a south-facing suite within a season, which is why the purchasing spec should hold every run to the same threshold regardless of where the pieces will be installed. The measurable language for the spec is a Delta E statement: color change measured instrumentally is reported as Delta E, and a change under about 1.0 is invisible to most observers, while 2.0 to 3.0 becomes noticeable in side-by-side comparison. Requiring “grade 4 minimum at 40 AFU and Delta E below 2.0” in the PO gives the QC team a number to verify instead of a color to argue about. The same Delta E discipline applies at order time when matching fabric to a Pantone or swatch reference, a process covered in our furniture color matching guide.

Test	Method	Scale	Hotel contract threshold
Lightfastness (xenon-arc)	AATCC TM 16	1 to 5 at 20/40 AFU	Grade 4 minimum at 40 AFU
Dry crocking	AATCC TM 8	1 to 5	Grade 4 minimum
Wet crocking	AATCC TM 8 (wet)	1 to 5	Grade 3 minimum
Instrumental color change	Delta E measurement	Delta E value	Below 2.0 after exposure

Verifying the numbers: report, swatch and production-run check

Three verification layers close the loop between the spec and the delivered sofa. The first is the laboratory report: the fabric mill or the factory should provide a test report from an accredited lab naming the method, the exposure and the grade, and the report date should be within the production cycle, not a generic certificate from two years ago. The second is the swatch check: order a production-dyed swatch and expose half of it to 40 AFU of xenon light locally, or have the lab do it, so the grade is confirmed on the actual dye lot rather than the mill’s standard shade. The third is the in-line check at cutting: a simple Delta E reading between the production roll and the approved swatch, using a handheld spectrophotometer, catches a bad dye lot before it becomes a container of mismatched sofas; our upholstery backing guide covers the adjacent layer that protects the dyed face, the rub-count side of fabric durability is in our sofa fabric types and rub count guide, and the factory-level checks behind all of them are documented in our quality control program.

When the fabric has already faded: containment and replacement

If a piece is already showing fading, the first step is diagnosis, not re-dyeing. Confirm the failure mode: a uniform lightening across the piece points to light exposure, while patchy change points to cleaning chemicals or moisture, and each has a different fix. For light fading, containment options are rotation of the piece out of the window line, repositioning relative to the light source, and UV-filtering film on the glazing, which reduces but does not stop the damage. Re-dyeing upholstery in place is rarely durable because the foam, thread and trim are already exposed, and the new dye will not match the original base; when a grade-3 fabric has failed in service, the reliable path is replacement of the affected covers or pieces with a grade-4 or better fabric. The replacement decision should also revisit the original spec, because reinstalling the same grade repeats the same failure on the same timeline; program-level checks of the spec and the supplier are covered in our sofa supplier QC report audit.

Frequently asked questions