Standard Guide for Microspectrophotometry in Forensic Paint Analysis

Importancia y uso:

5.1 This guide is designed to assist an analyst in the selection of appropriate sample preparation methods and instrumental parameters for the analysis and comparison of paint pigments and colors. When used for comparison purposes, the goal is to determine whether any exclusionary differences exist between the samples.

5.2 Paint sample spectra can be measured by reflectance or transmittance spectroscopy for comparison purposes. Transmittance measurements are generally preferred and are required for the analysis of UV absorbers in clear coats and the detailed analysis of effect pigments that are not opaque. Emission comparison by means of fluorescence is also measurable.

5.3 It is not the intention of this guide to present comprehensive theories and methods of MSP. It is necessary that the analyst have an understanding of UV-Vis-NIR MSP and general concepts of specimen preparation before using this guide. This information is available from manufacturers’ reference materials, training courses, and references such as Eyring (1),3 Stoecklein (2), and Purcell (3).

Subcomité:

E30.15

Referida por:

E1610-18, E1732-24E01, E3234-20

Volúmen:

14.02

Número ICS:

07.140 (Forensic science), 17.180.30 (Optical measuring instruments), 87.040 (Paints and varnishes)

Palabras clave:

forensic paint analysis; microspectrophotometer; microspectrophotometry; MSP;