The IULTCS (International Union of Leather Technologists and Chemists Societies) rubbing fastness test is a standard method used to determine the colorfastness or resistance of dyed or printed leather to rubbing. It assesses how well the color of the leather holds up when subjected to friction or abrasion.

During the test, a piece of white cotton cloth is rubbed against the surface of the leather under specific conditions. The amount of color transfer onto the cloth is then evaluated visually or instrumentally, usually using a grey scale. This helps determine the level of colorfastness and the potential for staining or fading of the leather's color during normal use.

Rubbing fastness tests are important for assessing the durability and quality of leather products, such as apparel, footwear, furniture, and accessories. They provide valuable information about how well the dye or print adheres to the leather surface and resists wear and tear over time.