Scientific Publications & Testimonials about Lumicyano

Optimization of the revelation sequence of latent fingerprints on thermal papers

 

Florine HALLEZ, Pierre LEDROIT

Forensic Science Laboratory of the French Gendarmerie & Sorbonne University, Paris

Abstract :

Thermal papers are often difficult to analyze because of the darkening of the glossy side due to heat application or polar solvents used in classical processing techniques, such as ninhydrin or 1,2-indanedione/ZnCl2.
The aim of this study was to develop a revelation sequence that combines at best adequate detection methods so as to maximize the chances to reveal prints on these substrates with current methods and equipment.

 

Based on orientation tests on blank papers, this study has enabled the development of a new revelation sequence composed of six steps (thermal development (54°C and 85°C), Lumicyano, Whitening, Indanedione/ZnCl2 and ninhydrine). This sequence gives satisfying results without any additional equipment or special formulation.

 

Impact of One-step Luminescent Cyanoacrylate Treatment on Subsequent DNA Analysis

 

Alicia Khuu, Scott Chadwick, Sébastien Moret, Xanthe Spindler, Peter Gunn, Claude Roux

FSI - Forensic Science International, 2018 , FSI 9172

Abstract :

Fingermarks can be exploited for both their ridge detail and touch DNA. One-step luminescent cyanoacrylate (CA) fuming techniques used for fingermark enhancement, such as PolyCyano UV (Foster+Freeman Ltd) and LumicyanoTM (Crime Science technology), claim to be compatible with DNA analysis as they reduce the need for post-staining to increase contrast of the developed fingermark. The aim of this study was to determine the impact that these one-step luminescent cyanoacrylates have on DNA analysis and how they compare to conventional CA techniques. Four donors each deposited five sets of natural fingermarks, to which, a known amount of washed saliva cells was dispensed onto half of each set of fingermarks. Each set was treated with either a conventional CA technique or a one-step luminescent CA technique prior to collection and processing of DNA, with one set left as a non-fumed control. It was found that DNA was still recoverable and detectable following each of the treatments.

LumicyanoTM had a similar impact on DNA profiles as conventional CA fuming and with post-stain, however, the degradation effect of PolyCyano UV on DNA was greater than the conventional treatments. For quantities of DNA such as that from touch DNA, the use of PolyCyano UV to enhance fingermarks may impact subsequent DNA analysis by causing allele drop out at larger fragment sizes.

New Lumicyano Kit : Comparison Studies with the First Generation and Effectiveness on Nonporous Substrates

 

Bisotti, A.; Allain, C.; Georges, J.; Guichard, F.; Audebert, P.; Barbosa, I.; Galmiche, L.

JFI - Journal of Forensic Identification, 2016 , Vol 66, Is 6, 560-575

Abstract :

Lumicyano is a fluorescent cyanoacrylate that allows a one-step development of latent fingermarks without changing the fuming chamber settings. To improve the fluorescence intensity of the fingerprint revealed with Lumicyano as well as the stability of its fluorescence over time, the manufacturer of Lumicyano has developed a modified version (Lumicyano Kit), separating the cyanoacrylate (Lumicyano Solution) and the fluorophore (Lumicyano Powder). This study compares the first version of Lumicyano with Lumicyano Kit using a 1% and 4% Lumicyano Powder on nonporous substrates. This study demonstrates that on all of the substrates investigated (glass, aluminum foil, white and black plastic) on fresh or aged (one week, three weeks) fingermarks, the use of Lumicyano Kit improves the quality of the development.

About Lumicyano and its compatibility with DNA sampling

 

Gicquel, Kristen - Court appointed expert for genetic and fingerprint identifications attached to the Court of Appeal of Rennes, France

IGNA (Institut Genetique Nantes Atlantique), 2015 

Abstract :

This note aims to share the experience of IGNA using the new Lumicyano based fuming protocol. In addition to the results on fingerprint development, this note reports the compatibility of the Lumicyano technology with DNA analysis. This new technology provides a rapid and highly detailed fluorescent fingerprint development thus allowing both papillary and genetic identification on a single mark.

Pseudo-Operational Trials of Lumicyano Solution and Lumicyano Powder for the Detection of Latent Fingermarks on Various Substrates

 

Farrugia, K. ; Fraser, J. ; Calder, N. ; Deacon, P.

Journal of Forensic Identification, 2014, 64, 556-582

Abstract :

This study presents pseudo-operational trials comparing a one-step fluorescent cyanoacrylate process with a number of other enhancement techniques on a variety of substrates. This one-step pro¬cess involves a product, 4% Lumicyano, which is a solution consisting of 4% by weight of a powdered dye (Lumicyano powder) dissolved in a cyanoacrylate-based solution (Lumicyano solution). The cyanoacrylate in the Lumicyano solution may be of a higher quality than that used in the two-step products.

Evaluation of Lumicyano™ cyanoacrylate fuming process for the development of latent fingermarks on plastic carrier bags by means of a pseudo operational comparative trial

 

Farrugia, K. ; Deacon, P. ; Fraser, J. 

Science & Justice, 2014, 54, 126-132

Abstract :

This study is a pseudo operational trial to compare an example of a one-step fluorescent cyanoacrylate product, Lumicyano™, with the two recommended techniques for plastic carrier bags; cyanoacrylate fuming followed by basic yellow 40 (BY40) dyeing and powder suspensions. 100 plastic carrier bags were collected from the place of work and the items were treated as found without any additional fingermark deposition. Lumicyano™ appears to be a suitable technique for the development of fingermarks on plastic carrier bags and it can help save lab space and time as it does not require dyeing or drying procedures. Furthermore, contrary to other one-step cyanoacrylate products, existing cyanoacrylate cabinets do not require any modification for the treatment of articles with Lumicyano™. To date, there is little peer reviewed articles in the literature on trials related to Lumicyano™ and this study aims to contribute to fill this gap

A comparison between atmospheric/humidity and vacuum cyanoacrylate fuming of latent fingermarks

 

Farrugia, K. ; Fraser, J. ; Friel, L. ; Adams, D. ; Attard-Montalto, N. ; Deacon, P.

Science & Justice, 2015, 257, 54-70

Abstract :

A number of pseudo-operational trials were set up to compare the atmospheric/humidity and vacuum cyanoacrylate fuming processes on plastic carrier bags. The fuming processes were compared using two-step cyanoacrylate fuming with basic yellow 40 (BY40) staining and a one-step fluorescent cyanoacrylate fuming, Lumicyano 4%. The atmospheric/humidity process appears to be superior to the vacuum process for both the two-step and one-step cyanoacrylate fuming, although the two-step process performed better in comparison to the one-step process under vacuum conditions. Nonetheless, the use of vacuum cyanoacrylate fuming may have certain operational advantages and its use does not adversely affect subsequent cyanoacrylate fuming with atmospheric/humidity conditions.

Lumicyano™: A new fluorescent cyanoacrylate for a one-step luminescent latent fingermark development

 

Prete, C ; Galmiche, L. ; Quenum-Possy-Berry, F-G. ; Allain, C. ;                   Thiburce, N. ; Colard, T.

Forensic Science International, 2013, 233, 104-112

Note :

This study concerns Lumicyano V 1.0 (2013). Product not sold anymore.

Abstract :

A new luminescent cyanoacrylate (Lumicyano™) which allows one-step development without changing the fuming chamber settings (80% humidity rate, 120 °C fuming temperature) was developed and assessed. This study aimed at comparing Lumicyano™ to a conventional two-step process. A detailed sensitivity study was conducted on glass slides, as well as the processing of various non-porous and semi-porous substrates, usually considered as problematic for a dye staining step. The results indicate that Lumicyano™ detects fingermarks with equal or better sensitivity and ridge details than currently used cyanoacrylate. Secondly in luminescent mode, good ridges clarity and excellent contrast are observed, even if Lumicyano™ is sometimes less bright than the two-step process. Furthermore, conventional enhancement can still be carried out if needed. As a conclusion, Lumicyano™ makes it possible to avoid an enhancement step which can be detrimental to further examinations, particularly on rough or semi-porous surfaces.

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