2. Color fastness. Pour hot water of about 80℃ into the basin first, and then put a towel up and down to wash it. The water in the basin does not change color, it is better. If there is obvious fading, it indicates that the quality of printing and dyeing is poor, which is harmful to human health.
3. Pull out one of the yarns on the edge of the towel and wind it into a circle, ignite it with fire, it burns quickly, the gray is black and gray, and it is light and free of residue. It is pure cotton or cellulose regenerated fiber. If the burning ash has hard lumps, it means that the yarn is a blended yarn mixed with chemical synthetic fibers.