In the textile industry, color fastness tests against water drops are performed in all textile products and leather products. While these tests are carried out in laboratories, pure water is dripped onto the leather product to be tested at room temperature and then impregnated with a glass rod. After waiting for two minutes and the water drop dries, the color change on the skin is evaluated with a gray scale. If waterproofing has already been done on the skin, water is dripped and observed on the inner surface of the skin.

Gray scale is a standard grade scale used to determine the color sensitivity of textile products and to evaluate the test results. There are gray colors that gradually become darker and numbered from one to five. One value shows the lowest fastness and five values ​​the highest fastness.

The result of the test is that there will be no discoloration of the leather product against water drops that will fall on the skin. To ensure that the assessment is correct, the test sample is once again evaluated by a second person on the gray scale.

Authorized laboratories also perform tests and analyzes to determine the water drip fastness of leather products within the framework of specific tests. These studies are based on standards published by domestic and foreign organizations. The standards considered for determining the water drop fastness of leather products are as follows:

• TS EN ISO 15700 Leather - Color fastness tests - Color fastness to water staining

This standard specifies a method to determine the staining effect of dripping water on various leathers.

• ISO 15700 (IULTCS / IUF 420) Skin - Color fastness tests - Color fastness to water staining
• ISO 105-E07 Textiles - Color fastness tests - Part E07: Color fastness spotting: Water