A problem of common occurrence in criminalistics is the
restoration of erased or obliterated marks such as serial numbers
on the chassis and the engine of a vehicle, or on a firearm and
personal identification marks or monogram on jewelry and items
of antique value. In some instances recovery of such original
marks provides an important investigative aid. The most
common techniques are stamping and engraving, though other
techniques may also be encountered. When a number is stamped
(indented) with a punch, the grains around and beneath the
indentation are deformed, and the depth to which such
deformation extends depends on the material in question, the
size of the punches and the force, which is used in making the
impression [1–4].
A problem of common occurrence in criminalistics is therestoration of erased or obliterated marks such as serial numberson the chassis and the engine of a vehicle, or on a firearm andpersonal identification marks or monogram on jewelry and itemsof antique value. In some instances recovery of such originalmarks provides an important investigative aid. The mostcommon techniques are stamping and engraving, though othertechniques may also be encountered. When a number is stamped(indented) with a punch, the grains around and beneath theindentation are deformed, and the depth to which suchdeformation extends depends on the material in question, thesize of the punches and the force, which is used in making theimpression [1–4].
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