The fastness grading both for shade change staining

The fastness grading for shade change staining could be summarized :

Gray-scale:                              Observation:                              Remark:
5                                           Obliviously no change                     Excellent fast
4 – 5                                      A few change                                    fast
4                                            Slightly change                                 fast
3 - 4                                      more than change                             Average
3                                           Moderately change                            Average                             
2 – 3                                    distinctly changed                              No fast                         
1 - 2                                     distinctly changed                              No fast
1                                           Completely change                            No fast

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