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Colour Fastness of Textiles | Color Fastness To Washing

Colour Fastness of Textiles | Color Fastness To Washing

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Salima Sultana Shimo
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Salima Sultana Shimo

Lecturer in Dept. of Industrial & Production Engineering at Bangladesh University of Textiles
Former Lecturer at Daffodil International University

Colour Fastness of Textiles | Color Fastness To Washing

Colour Fastness

The resistance of colour of  textiles to fade or bleed against different agencies such as light, wash,water, perspiration, rubbing, acid, alkali,hot pressing, bleaching etc. is called colour fastness.

Colour fastness is a term used in the dyeing of textile materials, meaning resistance of the material’s colour to fading or running. The term is usually used in the context of clothes. The first known use of the word colorfast was in 1916.

Color Fastness To Washing

There are five (5) test methods of I.S.O.-

Method i,ii,iii  Same procedure but only temperature varies.
Method iv,v Same procedure but only time difference and used for severe purposes.

Required Apparatus Color Fastness To Washing :

  1. SDC recommended multi-fibre fabric or recommended by ISO
  2. Grey scale for color changing
  3. Grey scale for staining
  4. Thermometer
  5. Dryer
  6. Color matching cabinet(Light box)
  7. Sewing machine.

Wash fastness tester and color matching cabinet :

Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing |  Textile Study Center | textilestudycenter.com
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Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing |  Textile Study Center | textilestudycenter.com
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Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing |  Textile Study Center | textilestudycenter.com
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Specimen Preparation of Color Fastness To Washing :
Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing |  Textile Study Center | textilestudycenter.com
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The tested sample is prepared as below:

  1. A 10 × 4 cm2 dyed sample fabric to be tested is taken.
  2. Another two pieces of fabric sample of 5 × 4 cm2 which are scoured, bleached but undyed is also taken-
  3. One will be same fabric undyed
  4. Other will be a multifibre fabric or indicated by ISO
  5. Now the dyed sample is placed between the undyed samples covering 5 × 4 cm2 area and stitched at the four edges, leaving 5×4 cm2 exposed, thus the specimen is ready for test

For Test Method i, ii and iii :

If the first piece is

The other piece will be

Cotton

Wool

Wool

Cotton

Silk

Wool

Polyester

Wool or cotton

Acrylic

Wool or cotton

Nylon

Wool or Cotton

For Test Method iv and v :

If the first piece is

The other piece will be

Cotton

Viscose

Viscose

Cotton

Nylon

Viscose or cotton

Polyester

Viscose or cotton

Acrylic

Viscose or cotton

Washing solution of Color Fastness To Washing :

Methods Solution
  For ISO i, ii, iii method

  5 gm/litre any of following two-

  1. ISO reference detergent  
  2. High grade soap solution can be used as alternative containing-
  1. Free alkali calculated as Na2CO3 = 0.3% (maximum)
  2. Free alkali calculated as NaOH = 0.1% (maximum)

  For ISO iv and v method

 

  ISO reference detergent – 5 gm/litre

  Anhydrous sodium carbonate – 2 gm/litre

The reagents and material are taken in a wash wheel and the recipes are as bellow –

Test method

Temp(0C)

Time

M:L Ratio

ISO-1

40º ± 2ºC

30 min

1:50

ISO-2

50º ± 2ºC

45min

1:50

ISO-3

60º ± 2ºC

30min

1:50

ISO-4

95º ± 2ºC

30min

1:50

ISO-5

95º ± 2ºC

4hours

1:50

After-treatment of Washing :

  1. After 30 minutes specimen is taken out.
  2. The specimen is rinsed twice in cold distilled water.
  3. Then it is washed in running cold water for 10 minutes.
  4. The specimen is squeezed and the stitching is removed from two long side (5 cm sides) and one short side (4 cm side) leaving another short side .
  5. It is dried at a temperature <=  60ºC.
  6. Then the rest side is unsewed.

Assessment :

 

Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing |  Textile Study Center | textilestudycenter.com
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Change in colour

The exposed part is compared with original dyed fabric with the help of grey scale. .

Staining :

The undyed fabric used for covering is compared with the original undyed fabric by grey scale for staining.

 

(109)

Salima Sultana Shimo
  • Save

Salima Sultana Shimo

Lecturer in Dept. of Industrial & Production Engineering at Bangladesh University of Textiles
Former Lecturer at Daffodil International University
Colour Fastness of Textiles | Color Fastness To Washing | Required Apparatus Color Fastness To Washing | Wash fastness tester and color matching cabinet | Specimen Preparation of Color Fastness To Washing | Washing solution of Color Fastness To Washing | After-treatment of Washing | Textile Study Center | textilestudycenter.com
  • Save
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