Serial number restoration- process and forensi application

1. Serial Number
Restoration
Submitted to-Ketan sir
Submitted by- Bhagyashree Pandagre

2. Serial Number
• A unique number and /or letter s
typically applied to an object by a
manufacturer .
• These stamps use hard steel dyes that
sinks into the metal up to a certain
depth.
• Firearms are stamped with an identification
serial number.These number are linked to the
buyer of the firearm.
• Firearm have serial number stamped into
their metal components.

4. Serial Number Restoration
• The practice of restoring an obliterated
serial number by using scientific methods.
• In many instances criminals will obliterate
serial numbers from objects so that
ownership may not be traced. Whether it is
a handgun or motor vehicle, it takes little
effort on the part of the perpetrator to grind
off these identifying marks.

5. Obliteration
• When serial numbers are obliterated, they are
generally ground down beyond the lowest point of
the original stamping.
• This results in the visible portion of the serial
number being removed.
• By removing the serial number, criminals hope that
the object can not be identified as having been
stolen.

6. Obliteration
The serial number is no longer visible due to
the removal of the top layer of the metal.
The area below the obliterated layer is
affected by the stamping process and is the
reason serial number restoration is possible.

7. Serial Number Restoration
An obliterated serial number
typically has a surface that has been
scratched so that the number is no
longer recognizable

8.  Serial Number Restoration
Process
The first step in the process of restoring the serial
number is to polish the surface by using sand
paper in progressively finer grits.
Polishing the surface will help in visualizing the
serial number.
The polished surface gives us specular reflection
(even, consistent reflection of light) where as the
area that is attacked by the acid will yield diffuse
reflection .

9.  Acid Etching
The acid reacts with the metal and
produces hydrogen gas bubbles
The result of the acid etching is a
restored serial number. The dark
appearance of the numbers is the
result of diffuse reflection.

11.  Documentation
The final step in performing a serial
number restoration is documenting the
recovered serial number. This can be done
by writing down the numbers or
photographing the results.
Additionally, the chemicals used to etch the
metal should be documented in the notes.

13. https://www.google.co.in/url?sa=t&sou
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Reference