Serial number restoration
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The document discusses serial number restoration. It explains that serial numbers are unique identifiers applied by manufacturers to objects like firearms. Criminals sometimes obliterate serial numbers to avoid identification. Restoration involves polishing the surface and using acid to etch away layers of metal, revealing the original serial number imprint beneath. The restored number is then documented through writing or photos. The process helps identify stolen objects by recovering the obscured identifying marks.
Serial number restoration
- 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.