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我们知道,冲洗黑白胶卷时是要得到负像的,然而,有时竟出现了该黑的不黑,该白的不白的逆转现象,即得到了正像,其原因何在呢?多由下述两因素所造成。一是在冲洗过程中,因安全灯使用不当,仍有微弱光使胶卷继续感光所致;二是在冲洗过程中,无意造成了二次曝光之故。不论是何种原因,造成出现正像的根源是相同的。 我们知道,胶卷冲洗的关键步骤是显影,它是将曝过光的银盐借助化学作用将其还原成黑色的银粒子,使拍摄曝光后所得到的“潜像”显示出来。而没有感光的银盐在定影时让其除掉。以保持所得影像不再消失,
We know that when processing black and white film is to get a negative image, however, sometimes it appears that the black is not black, white white reversal phenomenon, that has been just as the reason why? More by the following Two factors caused. First, during the flushing process, due to improper use of safety light, there is still weak light to make the film continue to be sensitive; Second, during the flushing process, the accidental result of the second exposure. Whatever the reason, the root cause of the appearance of the same is the same. We know that the key step in film processing is development. It is the process by which the exposed silver salt is chemically reduced to black silver particles, revealing the “latent image” obtained after exposure. And no sensitized silver salts let it get rid of when fixing. To keep the resulting image no longer disappear,