Chen painted Meiban first desalination ammonia, placed a moment, then painted with potassium permanganate solution, the last with sodium bisulfite solution processing and washing.

• 陈霉斑先涂上淡氨水，放置一会儿，再涂上高锰酸钾溶液，最后用亚硫酸氢钠溶液处理和水洗。