Color fastness to water droplet measurements, textile products dripped on the pure water, after drying the product to determine whether the stain on the examination. Some pure water is dripped onto the sample fabric to be tested and then this water is impregnated with a glass rod. After allowing to dry for two minutes, the color change on the fabric is evaluated with a gray scale (TS 423-3 EN 20105-A03 Textile - Methods for determination of color fastness - Section A03: Using gray scale for the assessment of color flow).

On the gray scale, there are gray colors numbered from 1 to 5 in increasingly darker tones. The lowest fastness value is 1 and the highest fastness value is 5. A light cabinet is used to evaluate with a gray scale, also called a fading scale.

As is known, dyes used in yarns and fabrics are subjected to and react to a number of influences during use or when cleaning garments. Good color fastness means that the fabric remains the same color tone and vividness despite these different effects. The color changes on the fabric are determined by different tests. Therefore, various fastness measurements and tests are carried out in the textile sector such as light fastness, washing fastness, water fastness, friction fastness, ironing fastness and sweat fastness. Water dripping fastness is one of them.

Water dripping fastness, which is made in order to determine the color changes of the dripping water on the fabrics, is determined in accordance with the following standard:

• TS EN ISO 105-E01 Textiles - Color fastness tests - Part E01: Color fastness to water

Water drip fastness determination studies should be carried out in laboratories accredited by national or international accreditation organizations in accordance with TS EN ISO / IEC 17025 standards.