mauve cotton fabric

8. Color fastness to dry cleaning
The current standards for dry cleaning color fastness tests are divided into the new version GB/T 5711-2015 and the old version GB/T 5711-1997. Old version: After the test, filter the solvent left in the container with filter paper, then pour it into a colorimetric tube, use transmitted light, use the staining gray card to evaluate its staining, and finally use the color change gray card to evaluate the color change of the sample. New version: Use an original sample and an untested adjacent fabric as reference samples, and then evaluate the color change of the sample and the staining of the adjacent fabric.