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我们在现场勘查中,经常遇到被犯罪分子触摸过的浅色纸张,用宁西特林显现法显现出的紫色指印消失较快,不宜长期保存。目前普遍用照像法固定,由于指印反差弱会造成个别特征不清晰,给鉴定工作带来困难。为解决这一难题,我们经过多次实验发现,利用复印技术固定宁西特林显现指印法,可以很好地解决这一问题。将犯罪分子触摸过的浅色纸张用宁西特林显现出紫色指印之后凉干,放到静电复印机平台上复印,在复印纸上即可得到与原物等大的黑色指印。我们在实际工作中用的是“施乐申贝1027”静电复印机,将复印机的“contrast”(反差)放在三档、四档上复印,指印反差效果最佳。
During the on-the-spot investigation, we often encountered light-colored paper that was touched by criminals. The purple fingerprints that appeared in the Ningxi Tering show disappeared quickly and were not suitable for long-term preservation. At present, the general use of photographic method is fixed, due to fingerprinting weaknesses will result in some of the characteristics is not clear, to identify the difficulties. To solve this problem, we have found through many experiments that the use of copy technology to fix the Ningxi Tlin apparent fingerprinting method can be a good solution to this problem. The criminals touched the light-colored paper with Ning Xitrin showed purple fingerprints after drying, placed on the electrostatic copier platform for copying, the copy paper can be obtained with the original and other large black fingerprints. We used in the actual work is “Xerox Shen Bei 1027 ” electrostatic copier, the copier “contrast ” (contrast) on the third gear, fourth gear on the copy, the best fingerprint contrast.