The soil evidence present on the tyres of the culprit’s vehicle helped in his proving his conviction.
There are a lot of evidences present in varied quantities at a crime scene. They can be in abundant amount like a pool of blood in case of murders, while in some cases the evidence may present in small quantity like soil samples, semen sample, etc. The evidence present at the crime scene in small amounts or in trace amounts, are called trace evidences. Though they are present in trace amounts still they play a vital role in the investigation of any case. The principle behind the appearance of trace evidences is the Locard’s Principle of Exchange which states that whenever two entities come in contact with each other, they leave their traces on each other. Since Trace evidences are always in minute quantities, therefore they usually remain unnoticed and if neglected can be a big drawback in investigation. Trace evidence is also known as “Silent Witness” because it has […]
Trace evidence is the microscopic material which are found on the crime scene and which have great significance in solving criminal cases. These are very small in nature which can’t be seen by naked eyes sometimes and can be transfered from one place to another very easily. Each and every contact leaves behind a trace and hence a person can be linked/unlinked to being present at a particular place. Trace evidence is also known as “silent witness”. Trace evidence links a culprit to crime scene, or things involved. Trace evidence is found in many forms from as large as brick to as small as hair strand. It can be used to investigate every type of crimes from rape to terrorist attack. Trace evidence characterize a particular environment there will be infinitesimally correlation between the evidences of different environment. Typically trace evidences include hair, fibres, bloodstains, paint, glass pieces, gunshot residues, […]
Pigments are finely grounded inorganic and organic insoluble and dispersible particles that provide essential properties such as color, opacity, durability, hardness, and resistance to corrosion of paints. They are different from dyes because they aren’t intended to dissolve in the host matrix system. Even after adding into the matrix, they still maintain their properties as they are inert. In the upcoming sections, we will describe the analysis of paint pigments. Paint Pigments give colors when applied to a surface of an object. There can be single or multiple layers of paint, each having its pigments giving different colors. Macroscopically, through the process of visualization, we can have a brief idea about the pigment type, either inorganic, organic, color shifting, metallic and pearlescent, or fillers and extenders. Its microscopic analysis can be accomplished by polarized light to check for minute details. Along with the analysis of paint pigments, we will also […]
Paint is a liquefiable mixture of organic and inorganic constituents such as pigments, resins, solvents, additives, fillers, and converts into a solid film after used on a substrate and forms a solid and good finish protective layer. There are different types of paint available. In the upcoming sections, we will learn about ‘Types of paints and their composition.’ Paints are usually used to protect the surface from pests, ultraviolet rays from the sun, rain, etc. It helps to keep the objects safe and clean. Paints increase the surface visual appeal, make it waterproof, and increase durability. Before you select any paint for a particular application, consider the physical properties. Along with the study of types of paints and their composition, we will also give a brief description of the uses of the paint types. Let’s begin! Majorly Used Types of Paint Oil Paints: Oil paints are used in three layers: primer, […]
A common person thinks of paint as a decorative material that decorates any substance such as doors, automobiles, walls, etc. However, for a forensic scientist, paint analysis acts as a vital piece of evidence used to investigate a crime. Just like fibres, hairs, and glass, paint is also deliberated as trace evidence. In the upcoming sections of this article, we will study the Forensic significance of paint analysis. Paint as trace evidence is generally transferred from the accused to the crime scene or victim’s body. Such evidence is relevant in hit-and-run cases, burglaries, assaults, etc. The primary purpose of the paint chips analysis is to link the crime scene with the possible suspects. The analysis of paint chips can also inform us of the paint type. The forensic investigators look for it to give information about the paint composition, such as pigments, binders, vehicles, resin, additive, modifiers, etc. Along with the […]