Crime Scene Technology, 2b - 21 Allée du Cercle, 59650 Villeneuve d'Ascq, France.
Forensic Sci Int. 2013 Dec 10;233(1-3):104-12. doi: 10.1016/j.forsciint.2013.07.008. Epub 2013 Oct 4.
Latent fingermarks developed by cyanoacrylate fuming often lack contrast; therefore further enhancement is required, such as dye staining. This second step is part of the conventional detection sequences performed by forensics practitioners. Dye-staining or powder dusting aims at improving contrast and at increasing the legibility of details, yet their use may at times be limited. Indeed powder dusting may not be effective due to unexpected adherence to the background, and poor affinity to the cyanoacrylate. In the same way staining processes can dye a whole semi-porous surface or may wash the marks. To avoid that second step, a new luminescent cyanoacrylate (Lumicyano™) which allows one-step development without changing the fuming chamber settings (80% humidity rate, 120°C fuming temperature) was developed and assessed. This study aimed at comparing Lumicyano™ to a conventional two-step process. A detailed sensitivity study was conducted on glass slides, as well as the processing of various non-porous and semi-porous substrates, usually considered as problematic for a dye staining step. The results indicate that Lumicyano™ detects fingermarks with equal or better sensitivity and ridge details than currently used cyanoacrylate. Secondly in luminescent mode, good ridges clarity and excellent contrast are observed, even if Lumicyano™ is sometimes less bright than the two-step process. Furthermore, conventional enhancement can still be carried out if needed. As a conclusion, Lumicyano™ makes it possible to avoid an enhancement step which can be detrimental to further examinations, particularly on rough or semi-porous surfaces.
通过茚三酮熏显显现出的潜在指纹通常对比度不足，因此需要进一步增强，例如染色。这第二步是法医从业者进行的常规检测序列的一部分。染色或粉末显尘的目的是提高对比度并增加细节的可读性，但有时它们的使用可能会受到限制。事实上，由于粉末意外地附着在背景上，或者与氰基丙烯酸酯的亲和力差，粉末显尘可能无法发挥作用。同样，染色过程可能会将整个半渗透表面染色，或者可能会洗掉痕迹。为了避免第二步，开发了一种新的发光氰基丙烯酸酯（Lumicyano™），它可以在不改变熏显室设置（80%湿度率、120°C 熏显温度）的情况下实现一步法发展。本研究旨在将 Lumicyano™与传统的两步法进行比较。在玻璃载玻片上进行了详细的灵敏度研究，以及对各种非多孔和半多孔基底的处理，这些基底通常被认为在染色步骤存在问题。结果表明，Lumicyano™在检测指纹的灵敏度和脊纹细节方面与目前使用的氰基丙烯酸酯相当或更好。其次，在发光模式下，即使 Lumicyano™有时不如两步法亮，也可以观察到良好的脊纹清晰度和出色的对比度。此外，如果需要，仍然可以进行常规增强。总之，Lumicyano™可以避免增强步骤，该步骤可能会对进一步的检查造成损害，特别是在粗糙或半多孔表面上。
