Color fastness: Color fastness means the resistance to changes when subjected to particulars of condition which is specified in terms of changes and expressed in terms to the magnitude.
Color fastness to washing is used for measuring the fastness of colored materials, which is carried out in dyeing lab. Based on different measuring procedures, the test can be varied. For quality assurance system, a record is maintained for dyed fabrics or finished fabrics. Computer color matching system (CCMS) can save the record.
Required materials: The followings are necessary for wash fastness test:
1. Sample size 40 x 100 mm
2. Multi-fiber at 40 x 100 mm
3. ECE detergent (WOB)-4g/L
4. Sodium Perborate (Na2BO3.H2O2-1g/L)-1g/L
5. Distilled water
6. Noramal cold water
7. Steel balls
Required instruments: Various types of instrument are required for measuring color fastness to wash, including rota wash, scissor and stitch machine.
Steps for measuring color fastness to wash: Color fastness to wash is an off-line quality assurance.
1. Cut sample and multi-fiber at 40 x 100 mm.
2. Take the sample with 50 ml ECE detergent (WOB) en 50 ml Sodium per borate. For marks and Spencer, take the solution by formula: (Sample fabric + Multi-fiber weight) x 50 ml.
3. Keep the sample under 60℃ for 30 minutes in Rota wash machine.
4. Rinse the sample twice with cold water.
5. Dry at 60℃ by hanging or by Flat iron pression but temperature should not be more than 150℃.
6. Dry the specimen and the change of shade & degree of staining is measured by Grey Scale and Staining Scale.
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