隐约指纹痕迹留下的汗液和油脂，成为上个世纪法庭科学最重要的人类识别码。 加拿大团队写到，“目前的情况有其特殊性，该指纹已存在多年，以及氰基丙烯酸盐粘合剂烟熏的成功，” 。 由于塑料袋是无孔的，因此在大约 30 年的时间里，进一步地促进了脱水过程。 处理过程给几十年前的指纹痕迹重新加湿，将它们永久地锁定在固定图案。 

Latent fingerprints are left with trace sweats and oils from unique patterns, providing the first great forensic human identifier about a century ago. “The current case presents a uniqueness due to the age of the revealed fingermark, and the paired success of cyanoacrylate fuming,” writes the Canadian team. Since the plastic bag is non-porous, it also further fostered the dehydration process in the roughly 30 years it was left untreated in storage. The treatment process thus rehydrated the marks left from the fingerprint decades before, and locked them in permanent patterns, the experts write. “It also reiterates the importance opening cold cases in order to treat and reassess their exhibits,” they write.

以上为软件自动抓取翻译，阅读原文请点击：https://www.forensicmag.com/news/2019/05/case-study-30-year-old-cold-case-fingerprints-come-light