3. Staining of washing liquid
For 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.

Stains on rayon clothes are pretty conspicuous. Fortunately, they come off relatively easily. Remove stubborn stains on your rayon garments promptly using a gentle spot-cleaning solution of equal parts vinegar and water. 

One of the most popular choices for cattle fencing is barbed wire. Barbed wire is known for its affordability and effectiveness in keeping livestock secure. However, it is important to note that barbed wire can be dangerous for cattle, as they may injure themselves if they come into contact with it. Therefore, it's crucial to use barbed wire responsibly and consider other alternatives if safety is a concern.