Fingerprinting and DNA comparisons are the most commonly used methods in criminal investigations. However, lip prints can also be used as a supplementary tool because of the uniqueness of morphological patterns. A lip print not only can be used for personal screening by its pattern, it also carries genetic information that enables personal identification. Nowadays, there are various kinds of plants that are used for biological and histological staining due to an increasing market value associated with their application and sustainability. This study assessed the ability of natural dye extract to develop latent lip print contrast images and to preserve DNA for short tandem repeat analysis. Results revealed that roselle extract showed potential for the development of vaseline-treated lip print contrast images on bond paper. Moreover, when roselle extract-stained paper was compared with unstained paper, short tandem repeat profiles were not affected. Therefore, such dyes could be utilised for the development of latent lip print contrast images and their application could be extensively used to establish a personal identification database for reference in criminal investigations.

中文翻译：

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凡士林处理结合天然染料提取物以增强唇印对比度图像

指纹和 DNA 比对是刑事调查中最常用的方法。但是，由于形态图案的独特性，唇印也可以用作补充工具。唇印不仅可以通过其图案进行个人筛查，还可以携带可以识别个人身份的遗传信息。如今，由于与其应用和可持续性相关的市场价值不断增加，有多种植物可用于生物和组织学染色。本研究评估了天然染料提取物开发潜在唇印对比图像和保存 DNA 以进行短串联重复分析的能力。结果表明，洛神花提取物显示出在证券纸上形成经凡士林处理的唇印对比图像的潜力。而且，当将玫瑰茄提取物染色的纸与未染色的纸进行比较时，短串联重复谱不受影响。因此，此类染料可用于潜在唇印对比图像的开发，其应用可广泛用于建立个人身份识别数据库，供刑事调查参考。