Examinando por Materia "Lectura de los Labios"

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Validation of Sudan Black as a lipstick revealer
(Universidad Privada Norbert Wiener, 1905-07-06) Cabrejo Castañeda, Violeta Emperatriz; Ascarza Gallegos, Justo Angelo
Cheiloscopy is the analysis of lip grooves. Its importance lies in its use for identifying individuals since its pattern is unique, similar to fingerprints, meaning it does not change with age. To reveal these prints, revealing powders are often used. When taken directly from the lips, lipstick is used. The aim of this research was to validate Sudan Black powder as a cheiloscopic revealing agent. The design was non-experimental, cross-sectional, and quantitative. A probabilistic sample of 152 volunteers was estimated, and lip prints were taken with lipstick (standard) and compared to latent prints on paper and vinyl revealed with Sudan Black from 1 to 30 days after collection. These prints were evaluated by three observers who analyzed the results using Suzuki and Tsuchihashi classification. Statistical analysis of the matches was conducted using the chi-square method, and the correlation of lip line count was assessed using Pearson’s r. Results showed a high match between the standard sample and the Sudan Black sample on paper, with no statistical differences and a high correlation (r > 0.9544) at 1 and 30 days. However, this was not the case with vinyl prints, where a statistical difference was found. It was concluded that Sudan Black can be used as a revealing agent for cheiloscopy on absorbent surfaces like paper up to 30 days after sample collection. This confirmed the validity of the hypothesis.