Detection of Latent Fingerprints on Paper at Different Intervals with two Ninhydrin

Abstract

The objective of this study is to detect fingerprint traces and compare the quality of latent fingerprints on various paper and relationship of the persistence of latent fingerprints that occur on various types of paper at various times, with two formulas of hydrin by detecting fingerprint marks on 5 types of paper. According to study, The quality of the latent fingerprints that appear on the paper when using the Ninh hydin formula 1 at the same length of time. Sharpness performance and can read the special characteristic point or the minutiae in the following order white letter envelope, white copy paper, convenience store receipt government Lottery and Newspaper. As for the Ninh hydin formula  2 has the following sequence white letter envelope Receipt, convenience store, white copy paper, government lottery and newspaper. The relationship of the persistence of latent fingerprints that occur on various types of paper in various time periods formula 1 the duration will be different, will not affect the appearance of the fingerprint. The fingerprint that are collected but will affect the type of paper. The detection of latent fingerprint marks used in formula 2. The found that at different times, there would be an effect on occurrence of latent fingerprint marks. And affects each type of paper that checks for fingerprint which it has statistical significance at the level of .05