The bath is provided with an arrangement to rotate 8 stainless steel jars, containing the test solution and the test specimen above the horizontal axis, at the specified speed. The bath is heated by means of 2 emersion heaters and the temperature is controlled by a capillary type Thermostat, which is fitted with a digital temperature indicator and can also be set with the preset counter as per the requirement.

After the mechanical hesitation, the change in color of the specimen and the standard fabric are evaluated by the standard grayscale. The change in color of the specimen and staining of the adjacent fabrics are assessed with standard grey scales.