缩微密度值的选定直接影响缩微品的质量。正确地选定密度值,从某种意义上说是整个缩微工作成败的关键,它决定着缩微工作各环节的技术方法以及今后的检测标准。我国档案的载体材料比较复杂,有的质量非常差,又经过多年的保管,出现了纸张发黄、字迹退色、扩散等一系列损坏现象,给档案缩微工作带来了许多困难。要想把这些复杂的原件拍摄成既清晰又能使其控制在一定密度范围内的缩微胶卷,难度是很大的。因此,对于档案缩微拍摄而言,密度值的选定就显得更为重要。我国有关部门制订的档案缩微拍摄密度的标准为0.8—1.5。但如何正确地运用这一标准则又是值得研究的。有些同志认为,只要把胶卷密度控制 The selection of microfilm density directly affects the quality of microfilm. Properly selected density value, in a sense, the key to the success or failure of the entire microfilm work, it determines the technical methods of the various aspects of microfilm work and future testing standards. The material of our archives is rather complicated, some of them are of poor quality, and after many years of custody, a series of damage phenomena such as yellowing of paper, fading of writing, and proliferation have brought about many difficulties for file microfilming. It is very difficult to film these complex originals as microfilms that are both sharp and controllable over a range of densities. Therefore, the choice of the density value becomes even more important for the file microfilming. China’s relevant departments to develop the standard archiving micrographic density of 0.8-1.5. However, how to correctly apply this standard is worth studying. Some comrades think that as long as the film density control