Click Here to Download Free E-books

Colour Fastness of Textiles | Colour Fastness to Light | Textile Study Center
Home Textile Testing Colour Fastness of Textiles | Colour Fastness to Light
Colour Fastness of Textiles | Colour Fastness to Light

Colour Fastness of Textiles | Colour Fastness to Light

167
0
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 | Colour Fastness to Light


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.

Textile Colour Fastness Test standards :

  1. Society of Dyers and Colourists ( SDC )
  2. American Association of Textile Chemists and Colorists ( AATCC ).
  3. International Organisation for Standardisation  ( ISO )
  4. International Wool Textile Organisation ( IWTO ) .

Factors Affecting The Color Fastness Properties :

  1. The molecular structure (e.g.) of a dye molecule: If the dye molecule is larger in size, it will be tightly entrapped inside the inter-polymer chain space of a fiber. Thus the fastness will be better.
  2. The manner in which the dye is bonded to the fibre or the physical form present.
  3. The amount of dye present in the fibre i.e. depth of shade. A deep shade will be less fast than a pale or light shade.
  4. The chemical nature of the fibre. For example, cellulosic fibres dyed with reactive or vat dyes will show good fastness properties. Protein fibres dyed with acid mordant and reactive dyes will achieve good fastness properties and so on. That is to say compatibility of dye with the fibre is very important.
  5. The presence of other chemicals in the material.
  6. The actual conditions prevailing during exposure.

Different Types of Colour Fastness :

  1. Colour Fastness to Wash
  2. Colour Fastness to Light
  3. Colour Fastness  to Rubbing / Crocking
  4. Colour Fastness  to Perspiration ( Acid / Alkali )
  5. Colour Fastness  to Saliva
  6. Colour Fastness  to Water ( hot )
  7. Colour Fastness  to Water ( Cold )
  8. Colour Fastness  to Sea Water
  9. Colour Fastness  to Chlorinated Water
  10. Colour Fastness  to Bleaching ( H2O2 / Hypochlorate )
  11. Colour Fastness  to Alkali 
  12. Colour Fastness  to Dry Cleaning
  13. Colour Fastness  to Hot Pressing

Assessment of Colour Fastness :

  1. Changes in the colour of the specimen being tested, that is colour fading
  2. Staining of undyed material which is in contact with the specimen during the test, that is bleeding of colour.

Instruments for the Assessment of Colour Fastness :

  1. Visual Assessment ( By Grey Scale )
  2. Automatic Assessment (By using spectrophotometer )

Grey Scale Assessment :

How to assess coloured textiles with grey scale :

With the grey scale, the colour contrast between before test and after test coloured textile is compared with the 09 (nine) pairs of colour contrast in the grey scale.

Multifibrea  Fabric :

Developed by the Society of Dyers & Colourists in 1986 SDC Multifibre DW is a testing fabric comprising of six different fibre components. SDC Multifibre DW can be used as an adjacent fabric in many of the ISO 105 C Series and E Series of colour fastness tests and meets chain store fastness test specification.

It is produced with a narrow weave construction and contains the following components, secondary cellulose acetate, cotton, acrylic, polyamide, polyester and wool.

Colour Fastness of Textiles | Textile Colour Fastness Test standards | Society of Dyers and Colourists ( SDC ) | American Association of Textile Chemists and Colorists ( AATCC ) | International Organisation for Standardisation  ( ISO ) | International Wool Textile Organisation ( IWTO ) | Factors Affecting The Color Fastness Properties | Different Types of Colour Fastness | Assessment of Colour Fastness | Instruments for the Assessment of Colour Fastness | Grey Scale Assessment | How to assess coloured textiles with grey scale | Multifibrea  Fabric | Multifibre Fabric Types | Grey Scale Rating | Textile Study Center | textilestudycenter.com
  • Save

Multifibre Fabric Types :

Fig : Multifibre Strip

Multifibre DW Multifibre TV
Secondary Acetate  Triacetate 
Bleached Cotton   Bleached Cotton 
Polyamide  Polyamide 
Polyester Polyester
Acrylic Acrylic
Wool  Viscose

Grey Scale Rating :

Fastness Grade

Shade Change of Tested Sample

Colour Fastness of the Sample

Staining condition of the Sample

Grade-5

No Change

Excellent

No Staining

Grade-4

Slight loss in Depth

Good

Very Slight Staining

Grade-3

Appreciable loss in depth

Fair

Moderate Staining

Grade-2

Significant loss in Depth

poor

Significant Staining

Grade-1

Great Loss in Depth

Very Poor

Deep Staining

(167)

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 | Textile Colour Fastness Test standards | Society of Dyers and Colourists ( SDC ) | American Association of Textile Chemists and Colorists ( AATCC ) | International Organisation for Standardisation  ( ISO ) | International Wool Textile Organisation ( IWTO ) | Factors Affecting The Color Fastness Properties | Different Types of Colour Fastness | Assessment of Colour Fastness | Instruments for the Assessment of Colour Fastness | Grey Scale Assessment | How to assess coloured textiles with grey scale | Multifibrea  Fabric | Multifibre Fabric Types | Grey Scale Rating | Textile Study Center | textilestudycenter.com
  • Save
Share via
Copy link
Powered by Social Snap