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Colour theory and the evaluation of an instrumental method of measurement using geological samples for forensic applications

By
Debra J. Croft
Debra J. Croft
Kenneth Pye Associates Ltd, Crowthorne Enterprise Centre, Crowthorne Business Estate
Old Wokingham Road, Crowthorne RG45 6AW, UK
(e-mail: d.croft@kpal.co.uk)
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Kenneth Pye
Kenneth Pye
Kenneth Pye Associates Ltd, Crowthorne Enterprise Centre, Crowthorne Business Estate
Old Wokingham Road, Crowthorne RG45 6AW, UK
(e-mail: d.croft@kpal.co.uk)
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Published:
January 01, 2004

Abstract

Colour is a fundamental characteristic of many materials, including soils and sediments, and has been much used in geological, pedological and Quaternary science research. Traditionally, colour has been described qualitatively by visual comparison with standard charts, such as the Munsell Soil Color Charts or the Geological Society of America Rock Color Chart. Instrumental colour determination has been developed and used in industry for a variety of applications, including quality testing of paints, dyes and foodstuffs. In this paper, colour theory is outlined, and the Minolta® CM-2002® hand-held spectrophotometer is tested on geological samples to investigate reproducibility, discriminatory power, and accuracy in analysis. Standard methods for calibration, presentation and testing of a variety of (often small) samples have been developed. Examples are provided for the use of the method in forensic geoscience casework.

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Contents

Geological Society, London, Special Publications

Forensic Geoscience: Principles, Techniques and Applications

K. Pye
K. Pye
Kenneth Pye Associates Ltd & Royal Holloway, University of London, UK
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D. J. Croft
D. J. Croft
Croft Scientific and Technical & Kenneth Pye Associates Ltd, UK
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Geological Society of London
Volume
232
ISBN electronic:
9781862394803
Publication date:
January 01, 2004

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