Powdered soap snols are used during the manufacturing process. This heavyweight face towel is non-fluorescent and does not use chemicals such as synthetic detergents and fluorescent whitening agents until a single cotton yarn is made to the towel. We take 2-3 times more time and effort than regular products. Suitable for delicate skin and children. Do not wash with synthetic detergent. To maintain its natural texture, use bubble soap to wash it. There may be areas that appear black but are fragments of cotton leaves and stems. It is non-toxic.