color fastness to wash
Test of color fastness.
The property of a dye to retain its color when the dyed textile material is exposed to conditions or agent such as light, atmosphere gases,perspiration, washing that can remove the color. A dye may be resonably fast to one agent & only fast to another. Degree of fastness of color is tested by standard procedure.
Follow this step:
1. take two pcs of fabric about 5cm by 5cm, one is undyed cotton & the other undyed wool. stitch them together along one side.
2. sew around all four side of the cloth so that yarn is held in place.
3.Prepare a similar specimen with dyed materials that has satisfactory properties and place them in two jars with screw lids containing a solution of 5gm per litre soap or detergent solution at 30oC.
4. Agitate the two jars gently for 30mins, then remove the fabrics and wash them gently in clean water for 5mins. Open the stitching and separate the pieces to dry in air. Examination: 5.Place the dyed yarn next to a sample of the same material which has not been tested, and compare the change which has taken place. Compare also with the control sample with satisfactory properties. If the dyeing being tested shows equal or less change than the satisfactory sample, then it is as good as the satisfactory sample. 6.Place the wool and cotton cloths next to samples of the same material which have not been tested and compare them with the cloths that have been tested with a satisfactory dyeing. Equal or less staining shows equal or better fastness.
The property of a dye to retain its color when the dyed textile material is exposed to conditions or agent such as light, atmosphere gases,perspiration, washing that can remove the color. A dye may be resonably fast to one agent & only fast to another. Degree of fastness of color is tested by standard procedure.
Follow this step:
1. take two pcs of fabric about 5cm by 5cm, one is undyed cotton & the other undyed wool. stitch them together along one side.
2. sew around all four side of the cloth so that yarn is held in place.
3.Prepare a similar specimen with dyed materials that has satisfactory properties and place them in two jars with screw lids containing a solution of 5gm per litre soap or detergent solution at 30oC.
4. Agitate the two jars gently for 30mins, then remove the fabrics and wash them gently in clean water for 5mins. Open the stitching and separate the pieces to dry in air. Examination: 5.Place the dyed yarn next to a sample of the same material which has not been tested, and compare the change which has taken place. Compare also with the control sample with satisfactory properties. If the dyeing being tested shows equal or less change than the satisfactory sample, then it is as good as the satisfactory sample. 6.Place the wool and cotton cloths next to samples of the same material which have not been tested and compare them with the cloths that have been tested with a satisfactory dyeing. Equal or less staining shows equal or better fastness.
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