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Visual Appearance and Chemical Detection of Bloodstains on Concrete After Exposure to the Elements

Authors:
Sheri Shimamoto, Charles S. DeFrance, Thomas W. Adair
Journal:
Journal of the Association for Crime Scene Reconstruction
Published:
2013
Abstract:

We report on the experimental detection of blood on exposed concrete over a period of 428 days in the city of Aurora, Colorado. Neat (undiluted) blood was poured in an x- shaped pattern in each grid unit. The x-shaped pattern was chosen as a means of validating any reaction with possible false-positive properties of the substrate as well as to gauge how much deterioration of the pattern may occur over time, if any. Visible luminol reactions of the x-shaped pattern were detected from 14 to 156 days of exposure to the elements. A novel technique for extending this time frame using image enhancement is also discussed which extended the detectable reaction to 295 days.

Citation:
Shimamoto, S; DeFrance, CS; Adair, TW. Visual Appearance and Chemical Detection of Bloodstains on Concrete After Exposure to the Elements. J. Assoc. Crime Scene Recon. 2013, 19(2), 17-27.
PDF:
Visual Appearance and Chemical Detection of Bloodstains on Concrete After Exposure to the Elements
Keywords:
blood detection, crime scene reconstruction, image enhancement, luminol, Photoshop

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