The test results of the rubbing colour fastness tester can be used to judge the colour fastness of leather materials. Generally speaking, the following aspects can be used as the basis of assessment:

1. the degree of colour change: the degree of colour change in the test results is the main indicator for assessing colour fastness. Colour fastness is usually assessed by comparing the difference in colour before and after the test, using a colourimeter or human eye observation. If the colour change is small or almost unchanged, it means that the colour fastness is good; if the colour changes significantly, it means that the colour fastness is poor.

2. Colour transfer: Apart from colour change, colour transfer is also an important indicator for assessing colour fastness. Colour transfer refers to the phenomenon of colour transfer from one object to another. In the rubbing colour fastness test, if the colour of the leather sample transfers to the rubbing head or other contact object, it means that colour transfer has occurred. Little or no colour transfer usually indicates good colour fastness, whereas a large amount of colour transfer may indicate poor colour fastness.

3. Friction loss: The friction colour fastness test also assesses the resistance of the leather material to abrasion. By looking at the surface of the leather sample after the test, it is possible to check for visible wear, scratches or damage. If the leather surface loss is small, it means that the material's abrasion resistance is good; if there is obvious wear or damage, it means that the abrasion resistance is poor.

Taking the above factors into consideration, the colour fastness of the leather material can be assessed. Generally speaking, leather materials with better colour fastness have less colour change, no obvious colour transfer and less surface loss after the rubbing test. Leather materials with poor colour fastness are likely to show greater colour change, significant colour transfer and visible wear or damage.

It should be noted that different test standards and requirements should also be considered when assessing colour fastness, as different industries and applications may have different colour fastness standards. Therefore, reference should be made to the relevant standards or specifications when conducting the assessment to ensure the accuracy and comparability of the results.