U.S. flag

An official website of the United States government, Department of Justice.

NCJRS Virtual Library

The Virtual Library houses over 235,000 criminal justice resources, including all known OJP works.
Click here to search the NCJRS Virtual Library

Using Paint to Investigate Fires: An ATR-IR Study of the Degradation of Paint Samples Upon Heating

NCJ Number
246068
Journal
Journal of Forensic Sciences Volume: 58 Issue: 2 Dated: March 2013 Pages: 495-499
Author(s)
Kelly Roberts, M.Sc.; Matthew J. Almond, D.Phil.; John W. Bond, D.Phil.
Date Published
March 2013
Length
5 pages
Annotation
The aim of this work was to use spectral changes to paint samples to estimate the temperatures to which a paint has been heated.
Abstract
Fire investigation is a challenging area for the forensic investigator. The aim of this work was to use spectral changes to paint samples to estimate the temperatures to which a paint has been heated. Five paint samples (one clay paint, two car paints, one metallic paint, and one matt emulsion) have been fully characterized by a combination of attenuated total reflectance Fourier transform infrared (ATR-IR), Raman, X-ray fluorescence spectroscopy and powder X-ray diffraction. The thermal decomposition of these paints has been investigated by means of ATR-IR and thermal gravimetric analysis. Clear temperature markers are observed in the ATR-IR spectra namely: loss of v(C = O) band, greater than 300 degrees C; appearance of water bands on cooling, greater than 500 degrees C; alterations to v(Si-O) bands due to dehydration of silicate clays, greater than700 degrees C; diminution of v(CO3) and o(CO3) modes of CaCO3, greater than 950 degrees C. The researchers suggest the possible use of portable ATR-IR for nondestructive, in situ analysis of paints. Abstract published by arrangement with John Wiley & Sons.