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Use of Styryl 11 and STaR 11 for the Luminescence Enhancement of Cyanoacrylate‐Developed Fingermarks in the Visible and Near‐Infrared Regions *
Author(s) -
Chadwick Scott,
Maynard Philip,
Kirkbride Paul,
Lennard Chris,
Spindler Xanthe,
Roux Claude
Publication year - 2011
Publication title -
journal of forensic sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.715
H-Index - 96
eISSN - 1556-4029
pISSN - 0022-1198
DOI - 10.1111/j.1556-4029.2011.01846.x
Subject(s) - rhodamine 6g , luminescence , cyanoacrylate , materials science , rhodamine , persistent luminescence , photochemistry , infrared , luminescent measurements , near infrared spectroscopy , analytical chemistry (journal) , chemistry , nanotechnology , optoelectronics , optics , chromatography , fluorescence , molecule , organic chemistry , adhesive , physics , thermoluminescence , layer (electronics)
In current casework, most post‐cyanoacrylate stains rely on luminescence emission in the visible region (400–700 nm). While traditional stains such as rhodamine 6G work well under most circumstances, some surfaces may generate background luminescence under the same conditions. Detection in the near‐infrared region (NIR > 700 nm) has shown to be effective in minimizing the interferences from such surfaces. The laser dye styryl 11 generated strongly luminescent fingermarks when applied after cyanoacrylate fuming on all surfaces tested. When compared to rhodamine 6G, the dye was superior only when viewed in the NIR. Styryl 11 was subsequently combined with rhodamine 6G, and the mixed stain formulation (named StaR 11 by the authors) induced stronger luminescence compared with styryl 11 alone with an ability to visualize in both the visible and NIR regions. Reliable and consistent results were obtained when using either styryl 11 alone or the STaR 11 mixture. The enhancement achieved did not otherwise vary depending on the source of the fingermark secretions. With visualization possible in both the visible and NIR regions, the styryl 11/rhodamine 6G mixture showed significant potential as a post‐cyanoacrylate stain.