This machine is also called manual decolorization tester, manual decolorization tester, manual dry wet rubbing color fastness tester, dry wet rubbing color fastness tester and manual dry wet rubbing tester. It is mainly used for the decolorization degree of colored materials such as textiles, leather and paper by external friction. This machine is used for dry or wet white cotton cloth on the surface of the friction hammer (specified load). After rubbing the colored test piece at a certain speed and times, it is compared with the standard color card to evaluate the decolorization grade of the test piece.