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发现近年来有些底片出现黄斑现象，经过多次试验发现用以高锰酸钾为主所配制成的溶液处理返黄底片．能去除底片上的黄斑。
Found in some film in recent years appear yellow spots phenomenon, after many tests found that the solution prepared with potassium permanganate solution prepared yellow film back. Can remove the macula on the film.