工厂试验室所使用的各种 X 光标准片及其他底片,在频繁的使用过程中难免要受到损失,而这些损失又是无法补救的,尤其在多方面的使用情况下,一张底片往往是不够的,因此复制底片的意义就很重要了。我们参考《暗室技术》一文的介绍,经过反复实践,成功地复制了一批铝合金针孔 X 光标准片,从而满足了生产的需要,现将制作过程归纳如下: The various X-ray standard films and other negatives used in factory laboratories are inevitably subject to loss during frequent use, and these losses can not be remedied. In particular, in many applications, a negative film is often Not enough, so the significance of copying the film is very important. We refer to the “darkroom technology,” an article introduction, after repeated practice, successfully copied a number of aluminum alloy pinhole X-ray standard film to meet the production needs, the production process is summarized as follows: