Abstract：
:We have tested some widely used and practical fingermark enhancement techniques such as powdering (regular powder dusting and magnetic powder application), cyanoacrylate fuming, fluorescent dying (basic yellow 40), gun blueing solutions and acidified hydrogen peroxide solutions. The results were evaluated and compared in order to establish best procedures on processing cartridge cases. The tests were performed on brass discs subjected to three different temperatures (room temperature, 63 and 200°C), and on fired and unfired cartridge cases. All the samples were processed after three different periods of time (24h, 7 days and 14 days) after deposition. The best results for both fired and unfired cartridge cases were obtained by the sequential application of cyanoacrylate, gun blueing solution and basic yellow 40. Some stages of the firing process were isolated in order to identify their effects over the final amount and quality of the remaining latent fingermarks on cartridge cases. Good state fingermarks were developed on unfired cartridge cases cycled through the gun, showing that friction inside the gun without firing does not cause significant damage to the fingermarks. On the other hand, fired cartridge cases are significantly affected by the firing effects, exhibiting low quality ridge details which are mainly located next to base. An unexpected phenomenon was observed on most of the brass discs heated to 200°C and developed with gun blueing solutions; they presented a reverse development compared to the expected one, with darkening of the ridges instead of the background.
journal_name
Forensic Sci Intjournal_title
Forensic science internationalauthors
Girelli CM,Lobo BJ,Cunha AG,Freitas JC,Emmerich FGdoi
10.1016/j.forsciint.2015.02.012subject
Has Abstractpub_date
2015-05-01 00:00:00pages
17-26eissn
0379-0738issn
1872-6283pii
S0379-0738(15)00075-4journal_volume
250pub_type
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journal_title：Forensic science international
pub_type： 杂志文章,评审
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journal_title：Forensic science international
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journal_title：Forensic science international
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pub_type： 杂志文章
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journal_title：Forensic science international
pub_type： 杂志文章
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journal_title：Forensic science international
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