Dry vs Wet Crocking Tests for Coloured Webbing
Dry and wet crocking results answer different questions. A tape may transfer little colour to a dry cloth yet stain more when moisture changes friction or mobilises surface colour.
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In this guide
Key choices for your project
Write the named test method and edition, specimen face and direction, crock cloth, wet pick-up or conditioning, rubbing setup and buyer acceptance limits. Request separate dry and wet results. Report staining of the standard cloth separately from colour change or surface damage on the webbing, then review representative end-use materials where the product risk justifies it.
- Named method, edition and specimen face
- Separate dry and wet results
- Staining, colour change and surface damage reported distinctly
Dry passes, but damp contact leaves a mark
Consider a dark printed strap beside a pale jacket panel. The dry crock cloth shows little transfer, while the wet cloth is stained; the strap shows no obvious colour loss. A quick jacket rub gives another result because fabric and moisture are uncontrolled.
Verify the named dry and wet method, tested face, sample code and cloth preparation. Keep cloth staining separate from change to the strap. Use a defined assembly contact check only as supplementary product evidence.
Use separate, traceable dry and wet results, then add a controlled end-use check where risk warrants it.
Keep laboratory variables tied to one method
Crock cloth composition and preparation, moisture level, rubbing force, stroke length, cycle count and evaluation conditions are method-controlled variables, not fields to mix between reports. Identify whether printed, dyed, coated or jacquard faces are tested and whether the rubbing direction follows or crosses the webbing length. When comparing suppliers, use the same method and acceptance scale; a bare grade without this context is not comparable evidence.
- Cloth and moisture preparation
- Force, path and cycle settings
- Webbing face and rubbing direction
Distinguish transferred colour from a changed specimen
Crocking commonly evaluates colour transferred onto a specified light cloth. The webbing itself may also fade, polish, scuff or lose printed detail, which is a different observation and should be photographed and recorded separately. For a dark shoulder strap touching pale apparel, supplement the standard report with a buyer-defined assembly check against a representative garment fabric; do not replace the standard cloth result with an uncontrolled fabric rub.
- Staining grade on the specified cloth
- Webbing shade and surface observation
- Separate representative-material assembly check
Make each result traceable
A grade is usable only when specimen, method and evaluated effect are linked.
Swipe to see all columns ↔
| Field | Record | Confirm |
|---|---|---|
| Specimen | Colour, construction, finish, lot, face and direction | Match labels and report photographs |
| Method | Named method, edition and dry or wet condition | Check the procedure reference |
| Wet cloth preparation | Water, target wet pick-up and handling interval | Verify preparation and timing |
| Rubbing setup | Direction, force, path, cycles and contact face | Compare with the named method |
| Evaluation | Cloth staining grade, scale, light and evaluator | Check the retained physical cloth against its report |
| Separate observations | Webbing shade, print, coating and assembly result | Record outside the cloth grade |
Methods and limits are project-defined. One colour, finish or face does not automatically cover other variants.
Download specification worksheet ↓Investigate a dry–wet result without mixing evidence
Audit the report identity
Confirm sample code, colour, face, lot and method edition. Reject comparisons where dry and wet results use different constructions or undocumented preparation.
Reproduce a paired comparison
Use specimens from one identified sample and follow one named method. Keep direction and setup constant while changing only the prescribed moisture condition.
Read the two surfaces separately
Grade staining on the specified cloth, then document fading, polishing, scuffing or print damage on the webbing separately with labelled photographs.
Translate risk to the product
If pale materials contact the strap, run a buyer-defined check with controlled fabric, moisture, pressure and duration. Keep it supplementary to the method result.
Three ways to misread colour transfer
Average dry and wet grades
The conditions answer different contact questions, so one average hides the weaker mode. Report and decide on each result separately against its own limit.
Call every visible change crocking
Stained cloth, faded webbing and abraded print are different observations. Record each effect separately before deciding whether dye, finish or surface durability needs investigation.
Wash the failed specimen before diagnosis
Cleaning may remove surface colour or alter the finish that caused transfer. Retain the original cloth and tape, then test a separately prepared comparison sample.
Questions before you choose
Can a supplier simply state that the webbing has good colourfastness?
That description is not a measurable requirement. Ask for the named dry and wet methods, acceptance limits, colour and finish covered, sample identity and report date. A result for one shade or construction should not be assumed for every product variant.
Does a wet crocking result predict every sweat or rain situation?
No. It is a controlled comparison under the specified method. Actual contact also depends on moisture chemistry, duration, pressure, abrasion, cleaner, garment and assembly design. Use the laboratory result as a baseline and add a defined end-use check when the risk warrants it.
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