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Restoration ProcessIn the accompanying photos, a laboratory technician is restoring the once-obliterated serial number of a revolver. The four-photo sequence shows the gradual progression from total invisibility to clear readability. The technician is using a new process developed in an applications engineering project conducted by NASA's Lewis Research Center in conjunction with Chicago State University. Serial numbers and other markings are frequently eliminated from metal objects to prevent tracing ownership of guns, motor vehicles, bicycles, cameras, appliances and jewelry. To restore obliterated numbers, crime laboratory investigators most often employ a chemical etching technique. It is effective, but it may cause metal corrosion and it requires extensive preparatory grinding and polishing. The NASA-Chicago State process is advantageous because it can be applied without variation to any kind of metal, it needs no preparatory work and number recovery can be accomplished without corrosive chemicals; the liquid used is water.
Document ID
Document Type
Date Acquired
August 23, 2013
Publication Date
February 1, 1979
Publication Information
Publication: Spinoff 1979
Subject Category
Technology Utilization and Surface Transportation
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 20070019728.pdf STI

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IDRelationTitle20070019711Analytic PrimarySpinoff 1979