Vinay Aseri

Despite their presence at crime scenes, latent fingerprints are generally invisible to the human eye. we first ground the gram flour in a grinder after roasting the gram flour on a burner. using an ostrich hair brush, we applied the powder to various surfaces to develop fingerprints. Due to the powder’s low adherence on non-porous surfaces, it may be applied to a variety of contrasting surfaces and generates diverse effects. we first compared the results of our powder to those of previously published household-based powders, and then we evaluated the powders based on surface properties and other factors, such as treated surfaces, wet surfaces, rough surfaces, and more. Due to its non-toxic nature and low cost, this powder has the potential to be a low-cost and eco-friendly replacement in police practice for visualising latent fingerprints on a larger scale. 

Fingerprints are the friction ridges found on the fingers and palm of hands. These prints are considered the most valuable evidence in the court of law as these ridges provide uniqueness to every individual. Powder dusting is one of the prevalent approaches to developing fingerprints on various surfaces. This involves the application of finely formulated powders on the fingermark impression using a camel hair brush. in this article, we have used organic household waste materials like rose and hibiscus petals for developing the powders used in latent fingerprints development. The particle of powder gets adhered to sweat and moisture deposited on the surface of fingers, palm, and sole, which provide effective visualization and give the fingerprint details (minutiae). Finally, the formulation of the powder sticks to the ridges, and the excess powder is blown away. The powder is multicolored in this case, the patterns are apparent, resulting in an exceptional outcome. The objective of the study is to provide a replacement to the conventional, expensive and toxic laboratory powders. These organic powders are easily available, eco-friendly, cost-effective and non-toxic approach for latent fingerprint development and is a reliable technique to use at crime scene and future use.

Fingerprints are an important piece of evidence in crime investigation and play a key role in crime investigation due to their permanency, universality, uniqueness and of course availability. Utilization of water or any other liquids to destroy evidence by criminals is a very common practice. It becomes difficult to collect and analyse such evidence from underwater in terms of its forensic reproducibility, though not impossible. The methods employed are quite tedious, expensive and unreliable. There are many fingerprint powders accessible to the scientific examiners to recuperate and gather the unique fingerprint impressions submerged, the vast majority of them are for explicit materials like small particle reagent (SPR). The technique has been compromised by its downsides as it is highly toxic, very sensitive, low contrast and quite costly. An urgent and imperative need to foster an economical and effective, low cost fingerprint powder for underwater impressions by using the materials that are easily available. The present study was conducted to fulfil the same objective and proposes a modest unique fingerprint powder which provides great proficiency from a combination of surfactant sodium dodecyl sulphate (SDS) with chalk powder (yellow) and silver powder respectively.

Polycarbonate is widely used as structural material due to its extreme resistance to impact and perforation. In a crime involving firearms, the bullet may impact various objects fitted with or made of polycarbonate sheets leaving high chances of discovering the fractured PC sheets and fragments at the scene of crime; hence, these objects may become objects of the criminal investigation. In the present work the perforation pattern of PC sheets of thicknesses 8 mm, 10 mm, 12 mm and 15 mm at firing ranges 5 m and 10 m when impacted against 9 ×19 mm full metal jacket (FMJ) bullet were examined. It was observed that after impact, the PC sheet develops entry hole smaller than the calibre of bullet; formation of crack zone, plastic zone; and petalling on the distal face was observed. It was found that as the thickness of the sheet increases, the diameter of the entry hole increases, the diameter of the exit hole initially increases and then becomes constant. At 5 m range of fire the trend of crack zone becomes nearly constant from 8 mm to 15 mm thickness, however, at 10 m range of fire crack zone increases from 8 mm to 15 mm thickness. Furthermore, the diameter of the plastic zone increases as the thickness of the sheet increases (from 8 mm to 15 mm, respectively).