Determination of the Age of Bloodstains

Schwarzacher,

doi:10.2307/1147182

Cited by 21 publications

(8 citation statements)

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“…However, until now, the potential of using blood stains to determine the time when a crime was committed has not yet been materialized, despite several attempts. Already in the 1930s Schwarzacher attempted to correlate the age of a blood stain with the blood stain's rate of inhibition of solubility in water, which begins rapid and then decreases slowly as the blood stain ages [1]. Over the last two decades, many more techniques have been explored for this forensic quest, including oxygen electrodes [2], RNA degradation [3], atomic force microscopy [4], and electron spin resonance spectroscopy [5].…”

Section: Age Determination Of Blood Stainsmentioning

confidence: 99%

Age estimation of blood stains by hemoglobin derivative determination using reflectance spectroscopy

Bremmer¹,

Nadort²,

Leeuwen³

et al. 2011

Forensic Science International

111

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Section: Age Determination Of Blood Stainsmentioning

confidence: 99%

Age estimation of blood stains by hemoglobin derivative determination using reflectance spectroscopy

Bremmer¹,

Nadort²,

Leeuwen³

et al. 2011

Forensic Science International

111

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“…The Pearson linear correlation coefficient (Pearson's r), R 2 , root mean squared error (RMSE) and prediction accuracy (PA) values were also calculated to evaluate the calibration results. The RMSE was calculated by formula (1) and the PA was calculated by formula (2).…”

Section: The Tsd Of Bloodstainsmentioning

confidence: 99%

“…[1] Since 1930, Prof. Dr. Schwarzacher attempted to find the relationship between the solubility of blood in water and its TSD. [2] In 1960, D. Patterson used the changing color of bloodstains to determine the age of bloodstains. [3] The C. I. E. chromaticity coordinate was found relative to the TSD of bloodstains, but not a good linear relationship.…”

Section: Introductionmentioning

confidence: 99%

Identification and Determination of the Bloodstains Dry Time in the Crime Scenes Using Laser-Induced Breakdown Spectroscopy

et al. 2019

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The bloodstain is one kind of the most important evidences in crime scenes. Laser-induced breakdown spectroscopy (LIBS) technology was used in this paper to distinguish bloodstains from analogs and determine the time since deposited (TSD) of bloodstains. Combined with support vector machine classifier, the identification results of bloodstains from analogs achieved 96% in 20 s. Four kinds of substrates were chosen to simulate the grounds and lethal tools in crime scenes. The linear relationship between single spectral line intensity and TSD was analyzed. The Pearson linear correlation coefficient (Pearson's r) calculated on the stone bricks calibration result is higher than 0.9. The spectral line intensity ratio was proposed to improve the linear calibration relationship with TSD. Building the calibration relationship between intensity ratios and TSDs, the Pearson's r and R 2 values for results on all four substrates were improved. For stone bricks, ceramic tiles, and copper plates, the correlation coefficients were all higher than 0.95. Especially for results on stone bricks, the Pearson's r achieved 0.99024 and the R 2 value achieved 0.97571. The optimal single lines for calibration on four substrates were all related to Fe element and the optimal line intensity ratios were all ratios of an Fe line to a line of other elements.

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“…Early research made small steps forward in scientific knowledge, including exploring the solubility of blood in water over time, as the solubility rapidly drops over time before decreasing more slowly [19]. Other techniques have also furthered the understanding of the effect of time on blood stains, including the use of oxygen electrodes to establish the changes that occur to the oxyhaemoglobin-haemoglobin ratio in blood stains [20].…”

Section: Introductionmentioning

confidence: 99%

Age Determination of Blood-Stained Fingerprints Using Visible Wavelength Reflectance Hyperspectral Imaging

Cadd

Beveridge

et al. 2018

J. Imaging

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The ability to establish the exact time a crime was committed is one of the fundamental aims of forensic science. The analysis of recovered evidence can provide information to assist in age determination, such as blood, which is one of the most commonly encountered types of biological evidence and the most common fingerprint contaminant. There are currently no accepted methods to establish the age of a blood-stained fingerprint, so progress in this area would be of considerable benefit for forensic investigations. A novel application of visible wavelength reflectance, hyperspectral imaging (HSI), is used for the detection and age determination of blood-stained fingerprints on white ceramic tiles. Both identification and age determination are based on the unique visible absorption spectrum of haemoglobin between 400 and 680 nm and the presence of the Soret peak at 415 nm. In this study, blood-stained fingerprints were aged over 30 days and analysed using HSI. False colour aging scales were produced from a 30-day scale and a 24 h scale, allowing for a clear visual method for age estimations for deposited blood-stained fingerprints. Nine blood-stained fingerprints of varying ages deposited on one white ceramic tile were easily distinguishable using the 30-day false colour scale.

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Determination of the Age of Bloodstains

Cited by 21 publications

References 0 publications

Age estimation of blood stains by hemoglobin derivative determination using reflectance spectroscopy

Age estimation of blood stains by hemoglobin derivative determination using reflectance spectroscopy

Identification and Determination of the Bloodstains Dry Time in the Crime Scenes Using Laser-Induced Breakdown Spectroscopy

Age Determination of Blood-Stained Fingerprints Using Visible Wavelength Reflectance Hyperspectral Imaging

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