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CNN Forensic Files March 6, 2014 09:19:00

since the serial number on the shotgun had been ground off, investigators sent the gun to forensic scientist timothy duerr. he knew that scratch marks usually aren t as deep as the initial engraving. the serial number may only be a few thousandths of an inch, but the compressed metal goes a lot deeper into the metal. duerr applied an acid solution that when applied only goes at one level and goes no deeper. it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. the acid solution removed the top surface, leaving the bottom, or compressed metal, virtually untouched. upon utilizing restoration techniques on this shotgun, i was able to restore five of the ....

Winchester Shotgun , Timothy Duerr , Forensic Scientist , Serial Number , Acid Solution , Aren T , Uncompressed Metal , Restoration Techniques ,

CNN Forensic Files February 7, 2014 07:49:00

Investigators sent the gun to forensic scientist timothy duerr. he knew that scratch markings usually aren t as deep as the initial engraving. the serial number may only be a few hundredths of an inch, but the compressed metal goes a lot deeper into the metal. an acid solution was applied which only goes at one level and goes no deeper. it will actually eat away and you can actually burn past the point of compression. it reacts differently between the compressed and uncompressed metal. the acid solution removed the top surface leaving the bottom or compressed metal virtually untouched. upon utilizing the techniques on this shotgun, i was able to restore five of the eight digits in the serial number. those restored were l3145. but there was no shotgun with those serial numbers registered ....

Serial Number , Timothy Duerr , Aren T , Scratch Markings , Forensic Scientist , Acid Solution , Uncompressed Metal , Winchester Shotgun ,

Detailed text transcripts for TV channel - FOXNEWS - 20110703:10:34:00

An original copy of the tech cla declaration of independence. it was found at a flea market, and he s here to talk about it this morning. nice to see you, tom. as a historian yourself. did it blow you away to walk into the flea market and find it. no, because it looked like an old souvenir copy. and you thought it was worth nothing. yeah, virtually nothing. how did you figure out this was an actual copy. i had it for a long time and i saw these words facsimile and i figured it was an old copy and i looked, eventually found out what an anastatic facsimile was. what was that. it was printing used for a short time in 1846. it was used to make reproductions from originals, by placing an acid solution over the original and placing a zinc plate on it under ....

On The Table , The Tech Cla Declaration Of Independence , Flea Market , Historian Yourself , Souvenir Copy , Acid Solution , Zinc Plate ,