Affordable Access

deepdyve-link
Publisher Website

Strengths, Limitations, and Recommendations for Instrumental Color Measurement in Forensic Soil Characterization.

Authors
  • Dong, Christine E1
  • Webb, Jodi B1
  • Bottrell, Maureen C1
  • Saginor, Ian1
  • Lee, Brad D2
  • Stern, Libby A1
  • 1 FBI Laboratory, 2501 Investigation Parkway, Quantico, VA.
  • 2 Plant and Soil Sciences Department, University of Kentucky, 100 Nicholasville Road, Lexington, KY.
Type
Published Article
Journal
Journal of forensic sciences
Publication Date
Mar 01, 2020
Volume
65
Issue
2
Pages
438–449
Identifiers
DOI: 10.1111/1556-4029.14193
PMID: 31524965
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Color determination of soil evidence is often done by visual comparison to soil color charts. A handheld spectrophotometer was tested with representative materials for its suitability for forensic soil characterization. Instrumental colorimetry provides accurate colorimetry with ~10-fold better precision than a soil color chart. The minimum sample size for accurate color determination was between 0.02 and 0.04 mg of fine soil for the specific instrument tested. Reporting colors in the L*a*b* space permits quantification of ΔE00 , a measure of perceptible color difference, could enable objective quantification of small color differences and thresholds for forensic soil comparisons. A ΔE00 greater than ~ 3.5 to 6 likely indicates disparate soil sources in a forensic comparison, in the absence of confounding factors like sample alteration. Despite the superior precision of instrumental colorimetry, this approach is inappropriate for samples which are mottled at an inseparable scale, attached to a substrate, or too small for instrumental measurement. © 2019 American Academy of Forensic Sciences. This article has been contributed to by US Government employees and their work is in the public domain in the USA.

Report this publication

Statistics

Seen <100 times