To: Brad from Tennessee
"The FBI lab can usually raise these numbers if they are stamped on." Yep. If you've ever seen how footprints of compressed snow will sometimes remain after the surrounding snow has melted, it's an analogous process. When a serial # or other text is stamped into a metal it compresses the metal under the stamp increasing its molecular density as compared to surrounding metal. Even if the serial number is filed or worn down to the bottom of the impressions (i.e. the stamped digits and/or letters), the metal underneath will be denser, and when given a modulated acid bath to remove the less dense surrounding metal, they can generally be raised.
116 posted on
04/12/2013 7:46:41 PM PDT by
Joe 6-pack
(Qui me amat, amat et canem meum.)
To: Joe 6-pack; Brad from Tennessee; Youngin
Yep. If you've ever seen how footprints of compressed snow will sometimes remain after the surrounding snow has melted, it's an analogous process. When a serial # or other text is stamped into a metal it compresses the metal under the stamp increasing its molecular density as compared to surrounding metal. Even if the serial number is filed or worn down to the bottom of the impressions (i.e. the stamped digits and/or letters), the metal underneath will be denser, and when given a modulated acid bath to remove the less dense surrounding metal, they can generally be raised.While that is generally true, there are ways around it. The stamped numbers can be made unreadable easily enough if you know what you are doing.
Fortunately, most criminals don't know how to do this.
168 posted on
04/13/2013 12:41:30 AM PDT by
rmh47
(Go Kats! - Got eight? NRA Life Member])
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson