What are the testing methods for fabric color fastness?

Everyone will encounter this situation in life, that is, the darker the color of the clothes, the more obvious the fading will be. For example, black clothes will turn white after being washed a few times. In fact, these fiber textiles During the use process, color change will occur due to various external reasons such as lighting, washing techniques, friction between clothes, and chemicals. If you want to maintain the color fastness of the clothes, you must improve the color fastness during processing. After special craftsmanship, what are the methods for testing the color fastness of fabrics?

Methods for testing color fastness of fabrics
Generally, when evaluating color fastness, it is divided into 3-4 levels. So how to measure the level of fastness? We will look at the following standards. One of the standards is light fastness, which is also the most common way to test color fastness. It is divided into 8 levels during the judgment process, with level 1 being the worst and level 8 being the worst. Well, the method is to randomly select a piece of fabric from a piece of fabric and put them under the sun. After 8 hours of exposure, a special instrument will be used to detect their respective fading conditions.

From the perspective of soaping fastness
Of course, the color fastness testing method of fabrics, in addition to sun exposure, can also be judged by soaping. Before cleaning, A piece of white cloth will be sewn on the sample cloth. This can more clearly see the change in wash fastness. Then it will be put into the washing machine and then washed according to normal operations. This method is the fastest detection method. , and is divided into 5 levels in the judgment process. Level 1 means serious fading and level 5 means non-fading. Generally, if you want to quickly perform color fastness testing, you will choose this method, which is faster than the sun exposure method. Much more convenient.

Color fastness to washing/dry cleaning
Test the fabric samples under certain washing conditions (temperature, alkalinity, friction, etc.), and finally use gray cards to rate the samples. The color comparison results show that the color fastness to water washing of the samples of emerald blue, scarlet red, and navy blue is poor. The test principles of dry cleaning and water washing are the same.

Color fastness to rubbing
It is to place the fabric test sample on the rubbing fastness tester for testing. The test content includes dry/wet rubbing test. After the experiment, the gray card can be used Perform colorimetric ratings.

Perspiration/water stain color fastness
The test method is similar to the washing color fastness, except that the sample is tested under sweat or water stain conditions, and then the results are compared with the sweat stain Liquid proportioning.

The above is the fabric color fastness testing method compiled for everyone. I hope that after reading the article, you will have a better understanding of the fabric color fastness testing method.