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Theory:

Forensic chemistry:
Forensic chemistry includes scientific principles, techniques, and methods for investigating crimes.
For example, our daily newspaper contains a lot of news about robbery, murder and sexual harassment. How does the criminal department investigate and analyse it? In real life, the collection and analysis of evidence involve careful observation and precise scientific principles.
  
Forensic Chemists in Criminal Investigation:
  
In general, forensic chemists work in four stages of a criminal investigation.
  
i. Collection of sources:
  
They systematically collect physical resources such as knives, tools, and materials and use chemistry to uncover their information.
 
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Crime physical sources
  
ii. Analysis of evidence:
  
In criminal cases, chemists analyse substances such as blood and DNA to determine when and who do the crime.
  
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Crime scene analysis blood
  
iii. Cooperation:
  
They consult with fellow investigators such as police officers, detectives, and other forensic scientists to solve a crime.
 
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Various steps of crime investigations
  
iv. Report of findings:
  
Finally, they prepare the detailed conclusion of the analysis.
  
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File report 
  
Forensic chemistry method:
The world of forensic chemistry, which focuses on the theory and processes of chemistry in forensic analysis, demonstrates the role of chemistry in criminal investigations.
A forensic chemistry lab may use the following methods in crime investigation.
  
Fingerprint:
  
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Fingerprints
  • A fingerprint is one of the essential pieces of evidence in crime investigation.
  • Fingerprints on smooth surfaces can often be visible by applying light or dark powder, but fingerprints on a cheque or other documents often occur(hidden).
  • Occult fingerprints are sometimes made visible using ninhydrin, which turns purple due to the reaction with amino acids present in sweat.
  • Fingerprints or other marks are also sometimes made visible by exposure to high-powered laser light.
  • Cyanoacrylate ester fumes from glue are used with fluorescent dyes to make the fingerprints visible.