ASTM E 3406:2025

1.1 This guide is intended to assist forensic science practitioners (FSPs) with procedural recommendations for conducting spectral measurements of color on single fiber samples using ultraviolet (UV), visible (VIS), near infrared (NIR), or fluorescence emission analyses, and on comparing samples on the basis of these measurements. Spectral measurement of color (referred to as color measurement in this guide) by microspectrophotometry is part of a broader analytical scheme. 1.2 This guide primarily focuses on color measurements within the visible spectral range, but includes some details concerning measurements in the UV and NIR spectral ranges. The particular method(s) employed by each FSP depends upon available equipment, FSP training, sample suitability, and sample size. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This guide is intended for use by competent forensic science practitioners with the requisite formal education, discipline-specific training (refer to Practice E2917 ), and demonstrated proficiency to perform forensic casework. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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