Color change and staining are common in textile products in contact with water.
The purpose of the color fastness test to water is to determine the long or short-term water resistance of all kinds of dyed and printed textile products. By keeping the sample in distilled water, the degree of discoloration and staining of the accompanying fabric is determined by the penetrating water. ( ISO 105-E01 )
Used materials
Perspirometer device
oven
d whose temperature can be adjusted to 37 ± 2 oCestile water
Weight exerting a pressure of 12,5 kPa
Accompanying diapers
Multi-fiber accompanying fabric (multifibre) or two single-fiber accompanying fabrics (one of which is non-dyed fabric, polypropylene),
Gray Scale.
Sample preparation
A test sample measuring 10 cm x 4 cm is sewn to a 10 cm x 4 cm multifibre accompanying cloth along one of its short sides, with the front faces facing each other.
If the textile product is yarn or open fiber, approximately half the mass of the accompanying cloths is taken as yarn or fiber.
It is placed between a 10 cm x 4 cm multi-fiber accompanying fabric and the same sized polypropylene undyed fabric and sewn along all four sides.
Experimental Procedure
The test sample is placed in a flat-bottomed container with room temperature water and completely wetted.
The test sample is placed between two glass or acrylic resin plates.
Up to ten samples can be placed in the perspirometer test device at a time by placing a plate between them.
Even if the number of samples is small, ten plates can be placed in the device.
Then a weight exerting a pressure of 12,5 kPa is placed and the screws are tightened.
It is placed in an oven preheated to 37oC and left for 4 hours.
At the end of the time, each test sample is opened and separated from each other by removing all the seams except the short edge.
It is dried in air at a temperature not exceeding 60oC.
The discoloration of each sample and the discoloration of the accompanying cloths are evaluated with a gray scale.
Two different gray scales are used to determine the color change degree of the sample and the degree of contamination of the sample fabric to the accompanying fabric.
In both scales, there are 1 different values, 5 being the worst value and 9 the best value. (1- 1/2- 2- 2/3-3 3/4- 4 - 4/5- 5)
Evaluation is done in D65 daylight and on a gray colored surface with a slope of 45°.
To determine the degree of staining, the test stained material is placed side by side with the undyed original fabric and the difference between them is compared with the differences on the gray scale.
For the determination of the degree of color change; The tested sample is placed side by side with the original sample and again the difference between them is compared with the differences on the gray scale.
lessontextile 
