AATCC 8 Colorfastness to Crocking (Wet & Dry)

AATCC 8 Colorfastness to Crocking (wet & dry)

Purpose of Test

The colorfastness to crocking test method is designed to determine how much color is transferred from a colored textile to other surfaces. 

This test method was designed for textiles made from various fibers and with various coloring types:

  • Yarn
  • Other Fabrics
  • Dyed
  • Printed
  • Other Coloring Techniques

AATCC does not recommend this test for:

  • Carpets, or 
  • Very Small Prints

Terminology Defined

Colorfastness – Colorfastness is a fabric’s ability to retain color in various conditions.

Crocking – Crocking refers to the rubbing off of color from a fabric when subjected to abrasion.

Chromatic Transference Scale – The Chromatic Transference Scale is used to visually evaluate color transfer or staining during testing. The scale has multiple hues that allow a tester to match a hue from a color transfer test to a numerical score. 

AATCC 9-Step Chromatic Transference Scale (Image Source: AATCC)

Gray Scale for Staining – The Gray Scale for Staining is used in colorfastness tests for evaluating staining on undyed textiles. The scale has shades of gray correlated with numbers that allow a tester to match shades with a numerical score.

AATCC Gray Scale (Image Source: AATCC)

Test Method

Materials Used for Test

White test cloth squares

  • Dry
  • Wet with water

Testing Procedure

Timing of Test – the colorfastness to crocking test may be performed before or after any of the following:

  • Washing 
  • Drycleaning 
  • Shrinkage 
  • Ironing 
  • Finishing
  • Any other relevant cleaning or finishing treatments

Test Procedure (Summary)

Part 1: Rub Test – The textile being tested is rubbed with a white crock test cloth under controlled conditions.

Part 2: Assessment & Grading – Color transferred to the white test cloth is evaluated by comparing it with one of the following options: 

  • The Gray Scale for Staining, or 
  • The Chromatic Transference Scale 

A grade is assigned and evaluated against an acceptable quality limit.

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