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3. Staining of washing liquidFor the rating of staining of washing liquid after soap washing test (refer to FZ/T 73020-2019), the rating should be completed within 15 minutes after the test. After removing impurities from the soap liquid, pour it into a colorimetric tube, use the unwashed soap liquid with the same test temperature as the reference sample, and use the staining gray card to evaluate the staining degree of the washing liquid under D65 light source and white cardboard as the background.