In daily life, people would find that the sole and upper of newly white shoes would become yellowing.

Do you know why it would yellowing?

That’s because the phenomenon of color yellowing of footwear materials like PU polyurethane, UV-free antioxidant TPR thermoplastic rubber, and leather coated with polymer materials are likely to occur under exposuring to sunlight, ultraviolet light for a long time or in the heat, oxygen, stress, trace moisture, improper processing.

Reducing and prolonging the yellowing time has always been an urgent problem to be solved. Many shoe-making enterprises refer to HG/T 3689-2014 "Shoes for yellowing resistance test method" to determine the yellowing resistance of finished shoes and footwear materials. And the test of yellowing resistance has also become an important test for the quality management of the footwear industry.

What can we do in daily life to delay the yellowing of light-colored shoes?

The following methods are for reference only, and take care that do not to expose the shoes to the sun or to expose them to high temperatures.

A.Maintenance during washing

1. It is best to choose neutral detergent (soap with a pH value between 6 and 8, liquid detergent, etc.), do not choose ordinary alkaline detergent.
2. White shoes are better avoided being washed with water, and handled in time when shoes are a little dirty, so as to clean them up and prevent damage to the upper caused by long-term stains.
3. When drying after washing, better to use paper towel to wrap, it can prevent white shoes to become yellow and even let white shoes go back to the original color. Do not exposed to the sun. Ultraviolet light is the main cause of rapid yellowing.

B.Collection maintenance

1. The white shoe that does not wear temporarily, better clean thoroughly before collect, prevent dirty mark to remain for a long time to produce mildew possibility.
2. When collecting, choose dry place to store, better to put away in originally shoe box.
3. In order to protect the shape of the white shoes, it can also be inserted into the shoe last or the old newspaper to fix, it will be taken out as new.
4. A little desiccant can be put into the shoe box to anti-worms and keep dry.

Choose the shoes which are hard to discolor will let white shoes to maintain the beautiful white color all the time. How to know if a pair of shoes will turn yellow in a short time? Please choose GESTER GT-KD02 UV Light Discoloration Tester to test for you.

GESTER UV (ultraviolet) Light Discoloration Tester GT-KD02 designed to assess the resistance to discoloration of shoe materials. Specifically developed for white and light-colored upper materials, sole materials, leather, PU, fabric, and more, this tester is indispensable for evaluating the durability and color retention of footwear.

With the ability to replicate the damaging effects of sunlight radiation and high temperatures experienced during transportation, this innovative machine aids in identifying potential defects in shoe products. By subjecting materials to simulated environmental conditions, including exposure to UV light and elevated temperatures, the Anti-yellowing aging test chamber allows manufacturers and researchers to accurately assess discoloration and make informed decisions to improve their products.

In addition to its primary purpose as a discoloration tester, the GT-KD02 offers multifunctionality. It doubles as an aging tester, providing valuable insights into how shoe materials withstand long-term use and exposure to various factors. Moreover, it can be utilized as a dying oven, optimizing the dyeing process for enhanced colorfastness.

Compliant with industry standards such as ASTM-D1148 and HG/T 3689, the GESTER UV Light Yellowing Resistance Test Chamber GT-KD02 is a reliable and indispensable tool for shoe manufacturers, researchers, and quality control professionals. By utilizing this cutting-edge technology, you can ensure that your footwear products maintain their vibrant appearance and meet the highest quality standards.