Procedure for measure color fastness to dry & wet rubbing

          Requirement:

                  Sample size → 20cm × 7.5cm

                  Load → 9N ± 5%

                   Time   → 10 sec.

                   No of rotation / turns → 10

                   Crock fabric → 5cm   × 5cm

                   Temp     →       20°C ± 2

                   RH        →      65%± 2

 

1. At first, the fabric is cut as per requirement.
2. The fabric is set on the sample holder with a pin.
3. The crock fabric is set on the finger with the help of a clip.
4. The m/c is set to zero.
5. To rub (to & fro) is given within 10 sec.
6. Evolution is done with the help of grayscale for staining or Data color or spectrophotometer
The amount of color transferred from the specimen to crocking cloth can be estimated through chromites scale/ grayscale for staining.

Last update May-2022