利用碘-淀粉显色作用提取固定汗潜手印

Extraction of Fixed Sweat Latent Fingerprints by Iodine-Starch Chromogenic Action

汗潜手印在犯罪现场出现率较高,提取显现汗潜手印的方法有多种,因其显现范围受限、成本高、不便携带,很难在实践办案中推广应用。利用碘遇湿润的淀粉变蓝这一原理,尝试对司法实践中常见客体上的潜在手印进行显现固定。先用淀粉对碘熏手印进行刷显,然后用喷雾和小型加湿器进行加湿,手印即被显现固定,且效果良好;两周后观察,仍然没有褪色,说明碘-淀粉显色作用可以显现固定这些物品表面的潜在手印,有效地弥补了其它方法的不足,在基层实际办案中具有应用价值。

Sweat fingerprints appear at a high rate at crimescenes.There are many methods for extracting and showing sweat fingerprints.Because of its limited display range,high cost,and inability to carry,it is difficult to promote and apply in practice.In this study,using the principle that iodine turns blue when encountering wet starch,the potential fingermarks on common objects in judicial practice were attempted to be displayed and fixed.First,brush the iodine-fumigated fingerprints with starch,and then humidify them with a spray and a small humidifier,the fingerprints will be displayed and fixed,and the effect is good.After two weeks of observation,the color still did not fade,indicating that iodine-starch coloration can show the potential fingermarks fixed on the surface of these items.And can effectively make up for the shortcomings of other methods,and has application value in the actual case handling at the frontline level.