Abstract
This fiber population study has assessed the prevalence of the color and type of trace fibers present on upholstered seats in a specific setting to identify the most common and rare colors and to determine their evidentiary value. Nearly 22,000 fibers were collected via tape lifts from 25 fabric covered chair seats in a lobby area on Beale Air Force Base and examined microscopically to determine their apparent colors. Overall, blue and white/colorless were the most and nearly equally common colors (32.0 % and 31.5 %, respectively), followed by black/grey (19.6 %), brown (8.6 %), yellow/tan (4.9 %), and red/pink (2.5 %), while orange, purple, and green were the rarest (0.5 %, 0.3 %, and 0.3 %, respectively). Among rarest color fibers, plant-based fibers were predominant (77.7 %), consisting of mainly cotton, followed by synthetic fibers (17.4 %), then the least prevalent animal fibers (5.0 %). These color rankings align similarly to previous studies, despite the prominence of blue color fibers and higher proportions of brown and yellow/tan color fibers.
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