Color Fastness to Staining Testing: Standards, Methods, and Quality Evaluation for Textiles

Color fastness to staining testing measures the tendency of dyes to transfer from colored textiles to adjacent white or light-colored fabrics during washing, rubbing, perspiration, and water exposure. This technical guide explains the testing principle, internationally recognized standards such as ISO 105, AATCC, GB/T, and JIS methods, grey scale rating procedures, and practical applications in textile quality control and buyer compliance.

Technical Overview

Color fastness to staining, also referred to as colorfastness to bleeding or dye transfer, quantifies the degree to which color migrates from a dyed or printed textile specimen to an undyed adjacent fabric under specified mechanical, thermal, and chemical conditions. It is one of the most fundamental performance indicators in textile quality assessment and is always evaluated together with color fastness to color change, which instead measures fading of the specimen itself. While a fabric may retain its own shade well, insufficient dye fixation or poor wash-off can still cause severe staining of linings, trims, or co-laundered garments, making staining fastness a critical pass/fail criterion in most buyer specifications.

Staining fastness results are expressed on a 5-point grey scale for assessing staining in accordance with ISO 105-A03 or the equivalent AATCC Evaluation Procedure 2. Grade 5 indicates negligible or no visible staining of the adjacent fabric, while grade 1 indicates severe staining; intermediate half-step ratings such as 4–5 or 3–4 are commonly reported. Assessment is traditionally performed visually by trained operators under a standardized D65 light source in a color-matching cabinet, and instrumental assessment using a spectrophotometer in accordance with ISO 105-A04 is increasingly used to improve objectivity and inter-laboratory reproducibility.

Testing Samples

Dyed and Printed Fabrics

Finished dyed or printed woven, knitted, and nonwoven fabrics are the most common test substrates. Typical specimen dimensions are 100 mm × 40 mm for laundering, water, and perspiration tests, and not less than 50 mm × 140 mm for rubbing (crocking) tests. Fabrics with prints, discharge effects, or multi-color patterns are oriented so that all relevant colors contact the adjacent fabric.

Yarns, Fibers, and Made-Up Articles

Yarn is wound onto a suitable holder or knitted into a miniature swatch before testing, while loose fibers are combed and pressed into a compact pad. Finished goods such as towels, bedding, and hosiery can be tested directly by cutting representative areas containing all colors and components.

Garment Accessories and Trims

Zippers, zipper tapes, sewing threads, labels, elastics, webbings, laces, ribbons, and embroidery threads are frequently tested because they sit in direct contact with the main fabric and are a common source of cross-staining, particularly on white or pale ground panels.

Adjacent (Undyed) Fabrics

The staining receptor must be a standardized undyed fabric. Multifibre adjacent fabric per ISO 105-F10, containing six fibre stripes such as wool or acrylic, polyester, nylon, cotton, acetate, and viscose, allows simultaneous evaluation of staining affinity toward different fibres. Single-fibre adjacent fabrics per ISO 105-F01 through ISO 105-F07, typically two different undyed cloths, are used where required by the applicable method or buyer protocol.

Testing Items

The staining behavior of a textile must be evaluated separately under each relevant end-use condition. Commonly requested staining fastness items and their governing standards include:

• Color fastness to domestic and commercial laundering: ISO 105-C06, AATCC 61, GB/T 3921, JIS L 0844, EN ISO 105-C06
• Color fastness to water immersion: ISO 105-E01, AATCC 107, GB/T 5713
• Color fastness to sea water: ISO 105-E02, AATCC 106
• Color fastness to perspiration, acid and alkaline: ISO 105-E04, AATCC 15, GB/T 3922, JIS L 0848
• Color fastness to rubbing, dry and wet crocking: ISO 105-X12, AATCC 8 and AATCC 116, GB/T 3920, JIS L 0849
• Color fastness to chlorinated pool water: ISO 105-E03, AATCC 162
• Color fastness to dry cleaning: ISO 105-D01, AATCC 132
• Color fastness to water spotting and to storage in contact: ISO 105-E16 and related methods

Testing Methods

Composite Specimen Preparation

For wet-treatment tests, the specimen is placed face-to-face with the adjacent fabric and stitched along one short edge to form a composite specimen. This construction ensures intimate contact throughout the test so that any dye bleeding out of the specimen is absorbed by and deposits on the adjacent fabric, simulating contact staining in real use.

Laundering (Washing) Procedure

The composite specimen is treated in a rotating wash-wheel or laundering apparatus using a standard detergent solution, commonly at 40 °C or 60 °C for 30 to 45 minutes, with steel balls added to simulate mechanical abrasion. After treatment, the specimen is rinsed, the stitching removed, and the composite dried in air or at a temperature not exceeding 60 °C.

Water and Perspiration Procedures

For the water test, the composite specimen is fully immersed in distilled or deionized water for about 30 minutes. For the perspiration test, two composites are immersed separately in freshly prepared artificial acid and alkaline perspiration solutions containing histidine monohydrochloride. Each specimen is squeezed to approximately 100% wet pickup, placed between plates under a pressure of 12.5 kPa in a perspirometer, and kept in an oven at 37 °C for 4 hours before drying.

Rubbing (Crocking) Procedure

A crockmeter rubs a dry, or fully wetted, undyed crocking cloth against the specimen with a downward force of 9 N over a 104 mm stroke for 10 complete cycles. Wet crocking is generally more severe than dry crocking because water promotes dissolution and migration of unfixed dye, so both conditions are reported.

Rating and Reporting

After drying, the staining on each fibre of the adjacent fabric or crocking cloth is rated against the grey scale for staining under a D65 light source. When a multifibre adjacent fabric is used, each stripe is rated individually and the lowest grade is reported as the result. Instrumental rating transfers the colorimetric data of the stained and unstained reference cloths into a grey scale value, reducing operator subjectivity. Accredited third-party laboratories report staining results alongside the corresponding color-change results and the exact method variant applied.

Applications

Color fastness to staining testing supports quality decisions across the entire textile supply chain:

• Incoming fabric and trim inspection at garment factories to prevent cross-staining during production and storage
• Pre-shipment and batch-release testing against buyer technical manuals and national product standards
• Multi-color and multi-component garment risk assessment, including contrast panels, linings, and embroidery
• Sportswear and underwear evaluation for perspiration staining on skin-contact layers
• Swimwear and beachwear evaluation for chlorinated pool water staining
• Home textiles such as bedding and towels, where staining of co-washed items is a major consumer complaint driver
• Automotive and technical textiles, where trim components remain in long-term contact under heat and humidity
• Research and development for dye selection, fixing agent optimization, and wash-off process improvement

FAQ

What is the difference between staining fastness and color-change fastness?

Color-change fastness measures how much the specimen itself fades or shifts in shade after treatment, rated on the grey scale for color change per ISO 105-A02. Staining fastness measures how much color transfers onto the adjacent undyed fabric, rated on the grey scale for staining per ISO 105-A03. A single test, such as a laundering cycle, produces both results independently.

Which staining grade is considered acceptable?

Most buyer specifications and international product standards require a minimum grade 4 for staining to adjacent fabric, with grade 3–4 sometimes tolerated for deep shades such as black, navy, and dark red when agreed in advance. Grades of 3 or below generally constitute a failure and require corrective action.

Why is wet rubbing fastness usually lower than dry rubbing fastness?

Water swells the fibre and partially dissolves unfixed surface dye, allowing it to transfer readily to the wet crocking cloth. Thorough soaping-off after dyeing, appropriate dye selection, and application of fixing agents are the main measures used to raise wet crocking grades.

Can staining be assessed instrumentally instead of visually?

Yes. ISO 105-A04 defines a colorimetric method in which the stained adjacent fabric and an unstained reference are measured with a spectrophotometer and the grey scale grade is calculated from colorimetric difference formulas, providing objective, repeatable results suitable for laboratory accreditation and dispute resolution.

How can staining fastness be improved in production?

Key measures include selecting dyes with adequate fixation for the fibre, optimizing dyeing temperature, time, and auxiliaries, performing thorough wash-off and soaping to remove hydrolyzed or unfixed dye, applying suitable cationic fixing agents, and verifying each dye lot through routine laboratory testing before bulk release.