《感光材料》编辑部: 贵刊1980年第五期《彩底划伤条道的消除和底片保存》一文介绍了涂修相油(松节油)来掩盖片基划伤的办法,这的确是一种很实用的办法。但该文在解释其作用原理时说错了。该文称这种方法之所以能掩盖划伤,是因为涂了修相油“就等于在底片和光源之间增加了一层柔光,改变了光源性质,使投射到底片影像上的光线变柔,也可能使磨损条道在放大照片上消失。“这种解释不符合实际情况。 “Photosensitive Materials” Editorial Department: Your Fifth Quarter 1980, “Removal and preservation of color-coded scratches” describes a method of covering tarnishing of base film with turpentine oil (turpentine), which is indeed one A very practical way. But the article is wrong in explaining its principle of action. The article claims that this method is able to cover the scratch, because the repair phase coated oil “is equivalent to the film and the light source adds a layer of soft light, changing the nature of the light source, so that projection onto the film image light changes Soft, it is also possible to wear the track disappears in the enlarged photo. ”This interpretation does not meet the actual situation.