1, new mildew spots can be cleaned with a soft brush first, and then washed off with alcohol.
2. Old mildew spots should be coated with light ammonia water for a while, then with potassium permanganate solution, and finally wiped with sulfite solution.
3. A little mung bean sprouts can be wiped repeatedly at the mildew spot to remove the mildew spot.
The "appearance" of calligraphy and painting is related to value. A good calligraphy and painting, often due to mildew and stains, its value is greatly reduced. Therefore, it is suggested that units or individuals who collect paintings and calligraphy should pay more attention to the influence of environmental factors on display and hanging, and try to prevent problems before they happen.
Extended data:
The collection and protection of calligraphy and painting are influenced by environmental factors such as temperature, humidity, air pollution, dust, light, insects and microorganisms. Among these factors, the most basic ones are the temperature and humidity in the air.
Zhao Qianfu, a poet in the Song Dynasty, put forward that "the window must be oiled with paper, and the account must always be set up" in "Qing Ji in Dong Nei Lu", which should be used for reference by modern people.
At the same time, the problems that should be paid attention to when broadening painting:
1. Wear gloves when taking pictures;
2. Don't cough when you are near the painting;
3. Do not smoke;
4. Don't hang the painting for a long time, it will be easily deformed if it is hung for a long time.