Black clothes sweating with white marks may be due to inorganic salts, the human body sweat is composed of water and inorganic salts.
1. When the human body in a large amount of sweat, sweat will be adsorbed by the clothes, with the passage of time after the evaporation of water, the inorganic salts left to stay in the black clothes, because the inorganic salts are white so the formation of white marks.
2. Sweating more, white marks on the clothes is a normal situation, if especially easy to sweat, it is recommended to supplement water and salt in a timely manner, so as not to sweat too much leading to dehydration and other situations. In addition, usually should maintain personal hygiene, sweating should be changed in time to avoid cold caused by cold.
Usually can be appropriate exercise, enhance physical fitness, should pay attention to maintain a light diet, eat more vegetables and fruits, supplement vitamins. If there is any abnormal sweating, such as excessive sweating, night sweating (abnormal sweating after going to sleep, and sweating stops after waking up), etc., you should actively consult a doctor.